Dealership hasn’t cashed my check.

Location: Washington State.
I bought a car last June with a cashiers check. Last week I received a call from my bank stating that the check hasn’t been cashed and since it’s been a year, I will need to re-issue the check. No one from the dealership has tried to contact me or anything other than “hope you’re enjoying the car” or seeing if I want to buy a car type messages.

Honestly, I haven’t enjoyed the car. I was shown a carfax that showed it was a 1 owner car and not a rental. I happened to compare the carfax vin about 6 months after when we switched insurances and the carfax and actual VIN’s were different. Lo and behold it was a rental car. It’s a 2022 and I already needed brakes and other minor things. I didn’t contact the dealership after I found out about the VIN’s cause it had been 6 months and I felt it was too late to take it back.

What should I do?