faulty parts

I had taken amc expresservice code is 9162347689 from dell but in my last servise done by techiane I have acconaligment slip also in last service motherboard which he has changed is china mother board that why in wioas wirgen service is not coming so they are not giving us amc they put my express service code on hold but that was not our problem it fault of techiane at time of service I had tolde to him that parts which he has put in laptop was tampered in that case I had talked in dell but they tolde me that you will get warranty on that part ruchi khanna is solving our case but still it is not solved techiane which has given faulty parts in my laptop nane hardik I have recipet of parts which he has changed toll no is 18004250088