Unprofessional service rendered by Vodacom Repairs center in Pretoria city

I am very disappointed in the service I received from Vodacom Repairs center in Pretoria city. I took my Samsung S7 for repairs under cellsure insurance because the back cover was broken. The phone was returned to me but was not properly fixed. I took it back the same day but was still not fixed. I called in and was told to bring the phone again. It took more that a week to be "fixed". When I collected the phone the report stated that there was nothing wrong with it. Two days later the battery started shaking. When I took it back and called in the next day to check when I could collect the phone I was told that they are still waiting for the parts that they have ordered. I called the repair center 3 days later and was told that there was nothing wrong with the phone. I have tried to take the matter up with Vodacom in midrand have could not get any assistance. This is a waste of my time and money as I have to drive to fetch the phone when there's "nothing wrong with the phone".