Account suspension due to personal detail update.

Last week I upgraded one of my accounts, and at the same time, my details were updated, including my earnings. As my income per month had reduced, my credit limit has been automatically downgraded, resulting in my account being suspended, for being over the limit, due to the upgrade. This now means, that I can make absolutely no calls, not even to MTN, to correct this situation. I fortunately have Telkom internet communications, and have lodged an online e-mail request with MTN to have this situation remedied. I have received a reference number advising that the problem has been "escalated" to Credit Management and that it will be attended to in 2/3 days. As my cellphone account is the only telephone communication I have. I find this totally unacceptable.