unable to change credit limit

My cellphone account was previously with Nashua Mobile but was moved to MTN when the former closed shop.<br> <br> On being transferred to MTN, my credit limit was reduced to a ridiculously low amount.<br> <br> I have tried, unsuccessfully, to have the limit increased to even half of what it was before.<br> <br> MTN customer service sucks!!! Try calling them, you get put on endless hold before the call eventually drops!!<br> <br> If nobody gets back to me soon, I'll seriously consider moving to Vodacom.