Computech ***** on consumers

I received an email today stating that am owing R1200 on a service that was not rendered. When i call in they tell me i had to cancel services as loan application was declined, but no one said it on a call that i should cancel if loan isn't approved, now they saying im liable to pay, whereas they never debited my account for that fee of R390 and when i ask they say there were insufficient funds in my account on the 25th, my pay day. So il go to the lawyers with this dispute.