A/C fan speed?

Okay, I took the car to ford to get the ac evacuated and recharged. They alerted me to an issue with the condenser; it had a leak and had to be replaced. I paid to replace it. A week later I took it back to Ford because there was zero air flow in the front vents, but the rear was working normally. They informed me that the cabin air vent was clogged and needed replacing. I questioned this as it wouldn't suddenly stop blowing due to that it would have been gradual. A week later we got in the car and the ac was blowing hot air through the rear and when it was off if I was increasing driving speed air would blow through the vents for 10 to 20 seconds, and when accelerating the cars ac fan speed would decrease but only if the cars max A/C button was pressed or the cabin air recirculator button was on. I took it back to ford and they told me the fresh air inlet door
was stuck open and the part needed to be replaced. I agreed to do this, and it took them a week to get it fixed. When I received the car back it was blowing cold air everywhere and seemed to be working correctly. However, when you accelerated with the max ac button on or the recirculator button was on the fan speed would slow to nothing still. That night we got a horrible thunderstorm and apparently, they didn't get the hood cowl put back on correctly and water went down through the ac system destroying the blower motor and the blower motor resister. We took it back to Ford and they had to replace both of these, and their mechanic has admitted fault. They gave us the car back and said that the fan speed slowing is normal which it never did this before and I'm having trouble believing this. Can someone explain why it's still doing this I'm so frustrated with this. And it didn't have these problems until ford got ahold of it.