If the phone was originally delivered less than two years ago, it could potentially be a warranty case (unless for instance there’s obvious signs of damage, or the repair shop did something weird). Whether or not it is fixable depends on what’s broken. Common age-related faults on the FP1 appear to be broken (replaceable) batteries and broken charging ports on the motherboard. The latter is difficult to solder, but it has been done. If the motherboard is truly broken it can be replaced (even via Fairphone) but this is expensive (repair prices, part only price).
Fairphone support has a huge backlog at the moment, so they’re very slow in responding. Also, did you not get any response? If you didn’t get an automated reply stating a ticket number, then something has gone wrong. If you did, and it’s been weeks, you can ask here, or call them (details at the very bottom of the support pages and the support request form). It’ll probably help to have your ticket number ready if you contact them.