My Mercedes C250 2012 model was parked for a week and wont start

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When I attempted to start the first time it started and went off after about 10 seconds- the command displayed "anti-theft protection activated" . It has been two weeks now, I changed batteries in keys, reset the command, jump started but vehicle wont start. There is a constant clicking noise in the underhood fuse box which I identified as a relay. One time I tried to jump start and unfortunately I reversed to terminal polarity-wiper and fan were running till I disconnected jump start. command totally went off but dealership fixed that, command is working but still vehicle wont start. Dash display also blinks when key is turned in attempt to start