Sounds like someone hooked the battery up backwards and fried your electronics. I would call the shop that did the repairs and get on them. It might be as simple as replacing one or more fuses, or they might have actually fried your electronics. They need to fix it with no charge.
I second this. If it was all working when you brought it in, and now the electronics are fried, it’s their mistake. They need to fess up and fix it.