I definitely won't be servicing at potch Mazda again

My brother took my CX5for service on the 4 dec 2023 to Potch Mazda as I was out of town and couldn't take it myself. My brother said the service was poor and the lady helping him gave him another person's invoice instead of mine. When he tried to tell her she ignored her. Two weeks later , I called mazda potch requesting my cx5 service invoice for the 4 /12/23. Til now they have not sent it. So what proof do I have that my car was serviced?