vodacom service is non existence. Repairs faulty

I have signed a contact on the 25.09.2015. By 27.10.2015 I had to send it into repairs due to my Samsung S5 mic doesn't work at all (Job no ***). When I got my phone back on the 5.11.2015 I have noticed that the bottom left corner button light is not right. So I went back to ask what is wrong with it. The guy told me it came with the part and will reorder a new part for me but I can keep my phone for now and will let me know when the part has arrived. So I left but not even a week later I have noticed again my phone mic is not working properly again. I phone vodacom back and asked what must I do he said they will need to send it back to the head office repair centre to check on it.Today (23.11.15) I took my phone in and the lady that helped me said that the button that I was concerned about was actually a cracked LCD inside. My phone is now in for repairs again job no***7. our family has been a loyal customer for more than 20 years. I want to know from you how have you provided me a satisfactory service? This contact is only been 3 months and my phone is not working properly for 2 months, cracked my LCD bottom left corner while in repairs.