Take the photos, send them to insurance company, mortgage company, anyone that has a stake in the home.
Without a contract, the person that did that damage might still be (or maybe even more) liable - if they have any cash or assets - and are not dead broke - legal action might be worth your efforts.
There may also be criminal concerns, don't know, not a lawyer, not legal advice.
Get as many quotes as you can for the fix - and try your hardest to vet these people for cerdentials, referrals, endorsements, see if you can view their work, ask if they've ever done this work before (then let them answer) if they say yes, ask to see it and talk to pool owner. verify. that's my thoughts.