FNB deducts money from account for contract that does not exist!!!

I bought a cellphone on the banking app nearly 3 years ago. I clearly stated that I want the cellphone ONLY, not the simcard or contract, as I use my own prepaid simcard. From that time FNB Connect keeps deducting R240 and R125 from my account each monty by debit order. I want to know for what this is, because there is NOT a legal contract in place. I tried to stop these debit orders on various occasions, but they keep deducting month after month. I am now fed up with FNB Connect. Look up the original contract and pay my money back! I will never do any business with FNB again if this is the way they conduct business, being dishonest!! Every month the debit orders have a different ref number as well. This has to STOP now!