Cellphone repair has taken more than two months

on the 2nd of January i took my phoner back to sterns because it had faults in it. they told me that the will send it back to MTN and will let me know. on the 06th i went to check on it they said that the couriere company had not picket it up yet but will keep me posted. on the 16th i went back and they said they were unable to get hold of MTN and it was still not picked up yet. they never call to let me know what is happening and till the end of January. First week of February i went back and they told me thatr the courier had finally taken it, during the weekend i was informed that i have to pay monery to MTN for them to fix it since it was damaged but they do not have the account details for MTN. Till today am still waiting for them to send either my phone back or ther MTN details to make the payment for its repairs.