Struggling a month to change address

My address on my invoices (I get 2) are incorrect. I've updated my address on MTN Active and it displays correctly there, but my invoices remain incorrect. I contacted MTN, via email, for the first time on 25/06/2015.<br> <br> On 12/07/2015 I got an email from them stating that my address details have been updated as per my request. Guess what...it's still the wrong address!!<br> <br> So I mailed them back, guess now I'll have to wait another 2-4 weeks for a response.<br> <br> So I just wanted to tell people how bad MTN's customer care has become. They used to be quite alright, but not anymore. By the way, I emailed them because I was unable to reach the call center for over a week, I gave up on that eventually an decided to just email instead.