SIEMENS - Not working

Based on my complaint to one of the authorised service centre called mm dass which is near my residence at saidapet,they came and replaced the motor and timer which were in goood condition with second hand old motor and timer said that all are new by charging Rs.7150/- vide invoice cum receipt No.529 dated 1.11.2012.Since then it was not working and remain in old condition.I made complaint immediate over phone to mm dass and they promised that they will come and replace with new one on 7.11,2012 and they were asked us to be at home every day.Finally on 12.11.2012 i told them to take their materials by returning amount.But till today (18.1.2012)no body came for repairing but they made us mental torture by giving falls promised to keep us ideal in our home.Now the are not attending our phone call.