Contract Breach

I signed up with ADT and they promised me that the first 3 months will be free and it reflect in the contract. But since the first month they have been sending a debit order to my bank account. I phoned them and they said they will rectify but it's the 2nd month with the same story. And if I reverse the transaction, because ADT does want to refund, the bank charges me R40 each time. I think I m gonna terminate my contract with ADT.