Tablet repair

I submitted my Samsung tablet for repairs last month and only got it back last week. When i got the tablet back it only worked for a day and then just went dead on me and i had to sent it back again last week. To my horror i got an SMS from MTN saying i need to accept a quotation of R890. this doesn't make sense the tablet is under warranty and you didn't fix it properly anyway.<br> If MTN makes me pay for this i am going make it my mission to display my anger on social media and every channel available. i dont care how much it going to cost me but these networks need to start their customers. if Cell C lost with an individual so can MTN.