Bad Luck by MTN!!!

good day,i'm realy struggling with MTN service its been almost 3 weeks just to upgrade i must always phone to get any feedback .All that needs to be done as i'm understanding from MTN my number must go on to a new system then the upgrade can be processed.But yes no luck the first time they said it will take3-4 working days then nothing happen the 2nd time they said they promise on the latest 14 September and nothing still so i send an email and all they are say "not yet" what type off service is that.Please please help me this service from MTN is really bad.