Tried to steel my money

I took my Mercedes to them with electric windows not opening and door lock cable that was not hooked in they gave me a quote for R17000. They told me the main control switch was burnt out and door lock completely broken. I told them it's too expensive they then changed me R490 for the quote. At home I took the cover of the door, some dirt fell out showing it was not taken off. I cleaned the switch and hooked the cable and Walhalla all was fixed (20 minutes) . They almost managed to steel R17000 from me but luckely I was only taken for R490