Wait, accutane and antibiotics at the same time? That doesn't sound right.

My memory might be fooling me (this was 9 years ago) but what my dermatologist tried with me was:
1) antibiotics - which didnt have an effect
2) stronger antibitiocs - which worked well for a few months but then stopped working
3) accutane - this was a final resort since nothing else worked.

It was always only one or the other, not multiple different medications at once.

Accutane has some strong side effects which is why he was reluctant to put me on them straightaway even though I had a terrible case of facial and back acne. I really suffered for a few months but then things improved.

I didn't have to have any other treatments while I was on accutane. However towards the end of the treatment he did suggest some laser treatment if I wanted to get rid of scars, but that was optional.

I think the best advice I can give you is to check with a dermatologist instead of going with these beauty centres which sound dodgy.