No one answers calls

Friday 08 May went in store to open a contract, they said I will receive a sms within 2-24h that I may pick up the device. Saturday to Monday I tried called calling them about 50 times no one answers. I sent a mail to their customer care email they said they will get back in 5days time went to the store Monday afternoon just to find out the contract approved. but now they trying to call the call center regarding prorated calculation they are doing and no one to contract again MTN are misleading customers spent 30min holding for a customer care agent called head office they cant help called MTN Menlyn on *** which an ornament. I asked what is the prorated calculation bill they cant tell. When this contract ends, I WILL NEVER DO BUSINESS WITH MTN AGAIN!