how much is a replacement key? the mechanic said they are 320$ thats alot. on 2008 Dodge Grand Caravan

my mechanic that was to check my van for any problems hooked it to computer reader all weekend and it drain the battry so he jumped it then my key wouldnt work he said the car computer thought the car was being stoled so we needed new keys but he didnt get a key like we had he got 2 cheap keys that we would have to use now i am worried what else was affected???

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1 answer
I was told it was $179.00 when they ruined mine and replaced it on their own.