all my ford galaxy windows do not workand the heater unit dose not work,?

recently I had some work done to get the window wipers working, when I got the car back, I noticed that the heater and fan unit in the car did not work, as well as all the windows, there is no power going to the unit as the is no back light as well, when questioned the garage admitted that the plug for the window wipers kept coming out, It all worked when they got it, but they say it was not them, the passenger well dose get floodedfrom time to time and we have repalced the electic unit under the floor some time ago, please can you help