Delete a pairing

Rented a car recently.

Paired my phone with its blue tooth feature. Unpaired my phone with vehicle; returned car.

Deleted all reference(s) to the rented car that was on my phone.

Now… every time I pair my phone to play Spotify through an external blue tooth speaker my phone stops playing as it continuously tries to access the rented car that it was once paired with. Anyone have any idea how to stop this/remove the pairing with rented car?