Worst customer service ever

I have a galaxy s6 edge and gear s on contract with MTN,but both are giving issues. The contract is in my husbands name. I have handed the gear s in with the TT3 repair centre in January and after a week they gave me back the gear after just cleaning it and putting it on power saving mode and said it is fixed!!!(The battery and charging dock is faulty), needless to say that did not fix it. Then the samsung rep in the eastern cape Lara took my watch to TTS in PE to be fixed. After 3 weeks they told me yesterday that they dont have the parts and that they cant find it in SA. So I just have to be happy with not having a watch even though I pay for one!!!!! It is still under guarentee which means absolutely nothing to Samsung. While fixing my s6 edge they gave me a loan phone which didnt work when I took it back they said its not a loan phone,but another customers phone which are in for repairs,but the customer did not fetch it yet!!!!!! How can they do that. They cant do a quality check on my phone I must do it and let them know!!!!! How can I pay so much for suppose to be good items and then I get such pathetic service????