I bought Phone and the supplier is MTN

i bought a phone and i return because it was not working fine , Markham sent it to MTN say the damage is not cover on warrant because is a physical damage, so MTN did estimates so that they can fix it then i declined the estimates , so they say i have to pay 350 for their estimates which is the new MTN policy but this policy i didnt sign it the one i sign it say if i reject estimate they will return my phone without fixed no payment will be made