Upgrade

I got an sms from cellc that I qualify for an upgrade after numerous call I finally got to someone who said I cannot upgrade due to non payment. no on two occasions I had problems with cellc when I changed my account and they failed to change it by them. then the debit order goes through to the wrong account number. however I paid that cash in at Nedbank. Yet I cannot upgrade because of that. it was cell fault not mine. on my first complaint at Hello Peter [URL Removed] nothing was sorted out, on my second they did sort it out but now I cannot upgrade, so if I don't get satisfaction this time I am going to close my account and cancel all four my lines and go to another supplier