Engine cranks but does not start?

I went to the store and when I came out the car wouldn't start. It just cranked over, and I tried again but it only cranked no start. I remember when I got to the store it shook a little when I parked before I turned the key off but I didn't think much about it. My sister's boyfriend came and put his engine tester on the car, and he said it had a code relating to the VVT Timing solenoid he then cleared the codes to see if it came back up, but it didn't, but he also forgot what the code numbers were. But he said it was related to the VVT solenoid because he looked it up right then. I wish he hadn't cleared the codes. Anyway, I had a tow truck tow it to a friend's house and he had a friend of his check it out. The guy said he tested the spark plugs, and it had spark and he said he listened to the fuel pump, and it made noise, so he assumed it was working. Then he said he took off the valve cover to see if the timing chain looked ok. He didn't bother calling me with any of the information. But when I called to ask, he told me he took the valve cover off and that my car had skipped 4-5 teeth and that it was because of a loose tensioner and that he tightened it and set the chain back where it was supposed to be and it's all good now. I asked if it messed up anything inside and he said no. That kind of seems impossible from what I've researched Well, I question that because I know a little about cars and I don't think there is any way he could have done that. I think he is lying to try and make money off me. Wouldn't he have to take all that stuff apart to do that? Like the timing chain cover and so on. Also, I asked him if he check the VVT solenoid that the code had showed, and he told me that that would Not have anything to do with the timing chain and I told him from what I have researched it would have an effect on it, and he got upset because I was asking him questions. I even sent him a video showing how to check the VVT and all. Then he told me he ordered a Fuel pump because he doesn't think it has good fuel pressure. Wouldn't he have to check the pressure at the fuel rail up by the engine to know that? And he should have done that before he took the valve cover off. I think he should have talked to me before He did this and wouldn't he have to buy a new valve cover gasket so I'm wondering if he even put it back together correctly, I'm thinking he didn't even take it apart I think he is just telling me that so he can charge me. When I sent him the videos of what I found he said I'm making him frustrated and asked if I would do this if I had of took it into a shop. I told him Yes, I would it's my only car also I'm sure a shop would be keeping in contact with me and letting me know what was going on. I even asked if he took pics of the timing chain where it had jumped timing, and he said Well I could have but I didn't. I this point I don't know what I should do but from what I have read if he is telling the truth then I don't believe that he can just put the timing chain back on and tighten the tensioner and the car be ok It could fail again and be worse. I think that it should be taken apart and done correctly. Should I just take my car back? Is there a way I can tell if he did what he said? I'm thinking it might be the fuel pump or? And he's just telling me this. He probably didn't think I would know any of this or that I would question his work. I never told him to take my car apart, he was just supposed to check the spark, fuel, stuff like that. Sorry, this is so long. Can you give me some advice if what he said he did to the tensioner and timing chain is possible the way he said he did it? And anything else like the VVT ext. Thank you