The phone goes unanswered

I have been trying to call MTN all day to update my banking details, but my call keeps getting hung up after holding for over 30min, this is ridiculous. everytime I have to call Mtn regarding, billing, insurance or general customer care I have to go through such, everytime this happens, I end up here on hello peter and someone will call me and apologize. This is so unprofessional, how do you let people hold for over 30min then hang up while they still are holding. <br> <br> Katlego<br> ***