Water damaged car and forfeited warranty

My car is with the repairer since 25Nov2015 till to date . It was scheduled to be done by 24 Dec 2015. 18 Jan 2016 theIy extended with next four weeks because they picked up another fault yet he doesn't guarantee that after four weeks my car will be ready for collection, they might pick up another fault.<br> <br> Proper and ideal assessment was not carried out on the vehicle in consideration to water/moisture damage on electronic circuits and other mechanical parts that are water sensitive.decisions that are taken, those decisions are to my disadvantage and the future risk is tranfered to me.<br> <br> This trial and error method of fault finding and repair is costing me. It could happen that I wait 4 weeks after the other.<br> <br> No 1 can guarantee that it will be safe to drive could fail the car after repairs.On the assessors report, only the front passenger airbags were picked up and now rear airbags being faulty as well, now I have to wait another four weeks for the rear airbags to be repaired. Renault, Repairer and Mi way they not willing to give warranty on mechanical & electronics after and it had warranty before the damage. Mi way they not responding to enquiry and concerns. I send email