Tired and fed up with MTN!

I have taken out a tablet Contract (Samsung tab E) over and above my existing cellphone contract. I have been back at mtn canal walk 6 times since (this was 2 weeks ago) and the sim for the tablet is still not activated ! Not to mention that the first sim I received was the incorrect size, then they said that they cant activate the correct sim until the wrong sim is active. They keep saying they will query it when I am there but they never get back to me! I have dealt with 2 people and both just ignore. I am fed up! Petrol up and down , parking money each time - it has become a joke. Still no activation which I will obviously be billed for when I am not even able to make use of my tab yet! What must a person do to have something done ? Some thing I pay for !! Really dissapointed MTN , I used to think you were the best network and I have been a customer for almost 6 years! Oh and not even calling the activations department helps, because it has been saying there is an error please try again later for all of the 2 weeks I have been trying. I would appreciate omw feedback!!!