Repairing your lock cylinder is easy. Been there, done that. There is a guy on Ebay located in Turkey that sells you the parts you need. Description is OK, you'll find some videos on YouTube as well. I went this route and was back in action in 30 minutes.

I then fixed my remote key system and it was NOT the key or battery, it was the module that receives the signal (located in the rear hatch, not far from the 3rd brake light).