Wrong Billing

I have been having a problem with the account I know and one that was handed to MTN since November 2014. I have tried everything possible in my power to get ahold of these people (nashua), ans they have been giving me the run around. MTN has even blocked my number because of this, and it's a number I have been using for the past 10 years atleast. The only assistance, if I can call it that, from MTN is that it's not their problem and I need to sort it out with Nashua Mobile. <br> 1) How? if no-one can tell how to get ahold of them.<br> 2) Only they don't get back to all the emails I have been sending. Namely Judy Green, Refiloe Zulu and Edward Mathebula.<br> I have just about lost all patience with this.<br> And to top it off, I lost 1 of the sim cards because I cant use them, went to MTN and asked for a new sim, and guess what was the response? \first sort out your issue with Nashua mobile"I ask again"