Bad service

I would like to express my sheer disgust at the service received at MTN Sandton City. The staff there seem very uninterested in the client walking in. I was given a receipt with a number on in and was expected to wait until my number was called. I must have waited for over 20 minutes whilst some of the staff seem to be fiddling on their phones God know doing what. After making one of them aware of my frustration she blew me off like I didn't matter as a client. I am appalled by the level of interest shown to their clients. I may be an individual and my concern wont matter however I spit at their service. They are not worth my time and can go to hell.