MTN horrible service, bad business!

We would like to do 2 x Upgrades. I have called the Mtn direct and MTN can not help us NO STOCK why does MTN do advertising for the Galaxy 3 Bronze Smar****ch with a phone but do not have stock ? How can you sell something but do not have it to sell ??? That's just bad business.... Why does MTN direct do not come back to there clients ? (I have called a few times and Ernest would have come back it's after a week now) I have a query on my account and still NO REPLY I was billed for data that I did not asked for. Signal is very poor in Nelspruit area also NO REPLY????? After 20 years with MTN now we have to move to Vodacom... Is there a Manager or Director who can assist us with these issues and give us answers to why you take our money very month and we do not get a service?