To the service: Complete lack of professionalism, ...

To the service: Complete lack of professionalism, I brought them a diesel heater with a claim for a missing part (emergency fuel drain) they kept it for 1 week and returned it to me without the part in question.
I had put a bolt with a rubber seal on a car tire and they told me that if it doesn't flow I should use it that way. If I couldn't keep them busy, it would be best for them.
And I won't comment on the fact that even the manager didn't wear a mask.