1997 Toyota Camry Car Smell

I was getting a rotten egg smell from the car and I was told it was probably the catalyic converter. I went to my mechanic to ask him, he said the same thing. So I had it replaced. I am still getting that smell. I just recently had a tune-up before I had replaced the converter? I was also told that my car has 2 converters, but the guy in the parts dept at toyoyta said I only have one. What do I do now?