That is always shocking - when someone does damage just for the sake of vandalism. At least theft you can understand. If the wheels were the only thing damaged, certainly they could be rebuilt. People break or bend rims all the time (OK, maybe not all the time, but it happens) and you just have a new wheel built. In your case, two.

I still say a folding bike is not an appropriately serious bicycle for someone that commutes the miles you do every day, and your current ride seems to be questionable too, based on what you're telling us. The right bike for the job makes all the difference.