pathetic service

I have a data contract with a samsung tab and the device was faulty and i handed it in for repairs on 30 March.<br> I was then advised that the device battery was was faulty and that i needed to pay R583 to have the battery replaced. I was not happy with that response as i know for a fact that it was not the battery. i collected the phone and took it to Samsung directly and they advised the the system board was faulty and i need to pay R1539 which i am not prepared to do. So between MTN and Samsung, who do i believe. i am not happy with the service from MTN after having my contract and making sure its paid every month without single return debit order. I need my Tablet to be repaired by MTN or replaced