Incompetance

I am absolutely sick and tired of MTN, I signed a contract in September 2015 and have yet to receive an invoice, I have called and have asked for an electronic versions to be sent (I feel this is a breach of contract). And now to top the cherry on the cake my i-phone 5C has been losing or not keeping it time (clock) for about four months, I assumed it would right itself with a software update, there have been a few and it hasn't helped. I have called MTN and they said to go into a store. I really can't face Kenilworth store so went to Cavendish. I stood in a queue of 3 people and there were 3 people on duty. One of the guys then turned to the lady in front of me and said its my lunch, he then sat in a chair listening to head phones. I am not saying people can't have lunch but to take lunch at noon in Cavendish and sit in the store when a queue of about 10 people had now built up is not good service. The bottom line is no one could look at my phone and they need to send it away for 6-8 days with no option of a courtesy phone and I need my charger which I wasn't told on the phone.