Cancelled contract 6 months ago still billing me

Mtn Reference *** cancelled my contract with Nashua mobile on 3 lines 6 months ago , Mtn only stopped billing for one line 2 other lines have Been billed for past 6 months for approx R6600 , ported to telkom for past 6 months and Mtn still continue billing me !!!!!!<br> Sent approx 4 emails to [Email Removed] for past few months , did not receive any response or acknowledgment of receipt despite requesting.disgusting service and incompetence on mtn's part<br> Will never sign any future contract because of pathetic service and no toll free line to complain<br> Tried calling several times ,had to wait at least 10 min and just before getting through on my cell line and got cut off, managed to speak to Mpho sekese who said I will have to wait another month to be refunded !!!! And they thusfar only passed credit for R1219 and debit order billing cycle still active ,can't believe the incompetence!!!!