DirectAxis Keeps on taking money and support centre does not want to help

My loan was paid up in July, but this did not stop them from keeping on deducting money even after the account was settled for 2 more months now. I try to call them and the phone always just keeps on ringing until my airtime is finished. I have been emailing them since August to send back my money and stop the deductions but they just ask for proof of payment each time and when i give proof they ask for proof again and again. they say a representative will call me to sort out my account but this never happens. But they only call me to offer me new loans and when i tell them i don't want new loans i want my money back that is owed to me i only get someone else will call you for this as that is another department. Do not take a loan from them as you will struggle to stop paying them even if your account is settled