Diamondrensu - stone fell out and they are charging me to ship it back to be fixed

I just want to start off by saying, I do not recommend ordering from Diamondrensu. The ring came with a defect and when I reached out asking what my options were, it took 5 days before I got a response. Which I had already left for vacation. That’s fine, Ankit response was to ship it back. My partner decided the defect was small so let’s just keep it. Maybe an hr or so later a stone fell out so I had to email again saying we would like to keep the ring but now a stone fell out. Ankit’s responded to return it I then responded and ask for an address. 3 days later I receive an address with instructions to ship through usps. USPS is $60 to ship the ring! On the site it says he does not cover shipping. FedEx is $18 to ship it to Harrow UK. Now I am waiting for a response.

For $60 I wonder if I can just go to a local jeweler to get the stone fixed. We did manage to find the fallen stone.

The ring was over $850, I know I probably paid way too much but it was beautiful.