Banking details not changed as requested

On 28 Feb. 2015 I mailed all documentation required by Mtn to change the banking details for my cell phone. I received an automated response that my mail was received and will be attended to and that a consultant will contact me.<br> After a week I tried to follow up on the matter. Call the call centre, choose options. wait while listening to a few notes being repeated over and over while a voice tells you that an operator will attend to your call asap - and then you are just cut off!!!<br> I have made at least 50 calls to the Call centre between 7 - 31 March, all with the same end result. (Dial 809 for business accounts). As the amount due at month end was not deducted from my bank account as requested, I again started calling mtn - and the same thing kept happening!<br> I again mailed them last night, re-sending all the previous documents as well. I also asked a consultant to call me today. I have still not had any response from them! (24 hours later)<br> I last night transferred some money to pay my account so that my service would not be suspended.<br> This morning I received an sms from them to tell me my account is in arrears.<br> I've tried again at least 10 times today to speak to a human there!