Bad bad

We have a problem. We tried emailing and calling mtn but to no avail. My boyfriend has been trying to change his bank account details and to activate his Sim card but nothing and the whole issue is after 3 months they are threatening us with blacklisting his name. They are very quick to take your money but no communication. They put in the wrong banking details but my question is why not just send an email or call him? We also went to mtn twice. We are working class people we don't have time to go in the whole time because you guys are to lazy. Vodacom is very **** yes but at least they send emails or call us. Why can't you guys do the same?