Consumer Redressal

I lodged a complaint(8430519857) on 14/07/2014 to samsung customer care for our samsung front loading washing machine bought in AUGUST 2011 with reason clothes not drying up and machine was stopping with message 5D,firstly we called up MR MANAS who came to install our machine who advised to clear up the waste pipe or else lodge a complaint, on 15/07/2014 MR DEBASHIS came and without running the machine he opened the front door and started to beat the inner tub and after that when he ran the same it started making loud sound which was not there previously and told the inner tub broken and estimated Rs.3500 apprx after that we lodged a complaint to send some Sr engineer but MR AJAY PAL turned up on 21/07/2014 after numerous calls and estimated Rs.6500 apprx that too with a guarantee of only 3 months,now why so much difference in estimation with employees from same organization and they are not in a position to hear that the tub was broken by Mr MANAS originally.Please advise asap.