Porting to MTN: Biggest mistake I've ever made.

I switched from Vodacom to MTN in about November 2014 due to an interesting two-for-one data deal being advertised.<br> <br> The process was smooth and without trouble, and MTN gave good service until the end of January.<br> <br> The problem arose when suddenly when someone phoned me, and instead of hearing a ringing phone they heard an advert being played as my caller-tune. This confused many callers as they now thought my number was no longer operating.<br> <br> I have tried calling customer service to resolve this issue but have found no one willing to give me the time of day on my issue as it an unusual one.<br> <br> But this isn't the end of it.<br> <br> Recently, my cell phone has denied me access to my pre-purchased data bundles. I am constantly being told to \sign in to Mtn network"then when I tap on the notification I'm sent to a website telling me I have run out of airtime & data.<br> <br> However"