Benz1810

Hi everyone new here I had a brand new key made and programed in. My car is a 2003 CL 500 the key guy opened the side panel at the side of the dashboard to enable him to remove the key module not sure if that's the name of it the bit your key fits into so he could get it programmed. Since then Display Defective visit workshop. Car drives fine only issues stopped working Is my horn and drivers side side light now just flickers occasionally. All windows seats roof panel sunroof radio heater blower indicators low beam high beam. Dashboard everything works radio works... Any ideas please many thanks