3 mnths to process 'use your own device' contract

I processed an upgrade on my 2 cellphone contracts on 11th February and was told it has been processed and I'll know it' stone when I get an sms's with the new data.<br> Instead of getting an sms I received my invoice as per the old contract but even worse it now had an additional charge for the data as the contract had reached 24 months.<br> I have queried this over and over again and am repeatedly told it has been escalated and they are awaiting a response.<br> At what stage do MTN stop 'escalating' and actually pick up a phone to the department involved and just get the matter resolved?<br> This is pathetic. I have now received the 2 nd months invoices which are again incorrect and still no one can tell me what is going on.<br> If MTN aren't willing to process my upgrade then they should have let me know when I app**** and I would have cancelled my contracts and moved elsewhere.<br> I think it is disgusting that they cannot resolve a query since 11th of February!