Spam and/or inaccurate billing - no response

Yesterday I received an sms from MTN telling me that my data bundle has depleted and that I am now using data at OUT OF BUNDLE rates. My cellphone apps tell me differently.<br> <br> I immediately contacted MTN, asking for an urgent response to let me know exactly what the status is. And whether this was a real problem, or just another one of their marketing spam campaigns. I obviously gave them my cellphone number, so that they could investigate and contact me.<br> <br> The only response I have had so far, is an email asking for my cellphone number. The same number that appears on the email. I would like an urgent response to clarify the status. By close of business today.<br> <br> Possibly a related issue - yesterday morning I was removed from MTN's marketing list. Yet I continue to receive spam from MTN, which wastes my time and my money. I would like MTN to stop wasting my time and money by sending this garbage to my cellphone. With immediate effect.<br>