Consumer Redressal

i have been transfered to mumbai and called the aquaguard service centre to install my machine. on first visist I was told to change UV memebrane of the filter,and that the technician needs to bring his senior..next day evening he came and did some repairs and set the machine working but did not change of uv membrane..next afternoon..first they said that filters are fine but they will have to change the PCB AND UV MEMBRANE but FINALLY CHANGED THE FILTERS TOO AND GAVE A BILL OF RS.5370. the machine worked for two days and agian stopped working.i called them again and on next day they came and without said that pump will be require to be changed costing additional Rs 3500. thus i feel cheated and need redressal.