Bad service/ de*****ed

I’m highly disappointed on MTN (Sandton store ) to be specific as I have been with them for 10 year plus I bought a contract phone on August of which I stated that wasn’t interested on unlimited data usage but guess what the consultant who did the opposite when I bought the phone I asked the instalment to be debited on the 25th but the consultant put 21st instead so has to enquire with the store on what the instalment wasn’t debited only to find out that they put 21st as debit order day and that’s when i found out that Xolani who assisted me didn’t put my balance/limit to zero and I’m owing around 5000 for something I didn’t agree to actually for someone‘a negligence A ticket of enquiry for enquiry was logged and I asked the consultant Mbali the lady who was assisting me that I don’t need this extra usage whatsoever as I already have 2 routers and one with MTN but guess what it wasn’t cancelled nobody phoned me pertaining the update /investigation till my line was suspended again and again nothing was debited on the 25rh yet again on November,going back to the store was told the debit order is still 21st and now my bill was 21000 because nothing was cancelled that time. And seemingly the lady lady who helped me Mbali didn’t even log the ticket of enquiry I paid my instalment and was told that my line will be open this time around was helped by another lady who also **** to me till to date my line remains suspended MTN is this how your employees make extra money/profit by de*****ing customers to say I’m ****ed , have been going to the shop several times without being assisted and **** too.Thia is day light ******* as my contract states that I did not want extra usage whatsoever it makes me wonder if your employees are well trained or you just pick any Tom and Jerry to save us have been to the shop 3 times , phoning the customer care line which is time consuming and frustrating my router has been blocked yet I have paid.