Barred line due to ***** and *********** staff

On the 28 November 2015 I contacted MTN to suspend my line reason being my cellphone was ******. Some how the ***** **********ly used my suspended sim card and racked up a bill of R4100.00 over 2 days. I have on may occasions called MTN and have received numerous reference numbers submitted an affidavit with a case number and my query remains unresolved. I have contacted and advised MTN not to suspend my account reason being I am not responsible for those ********** calls. To my surprise my line is barred. MTN your service is shocking and its the worse services I received you have no integrity what so ever no one calls you back or responds to any e-mails. reference no ***, ***, ***, ***, re- ***2, ref *** case ref ***. Please note I have been a customer with MTN for more than 10 years on your network I will not be a customer in the future.