Pit Stop 500

Recently I had an oil change done at pit stop 500 on 101st western (10/29) one week later my transmission blew out! The mechanic (who rebuilt it 2 months prior) asked if I had an oil change recently ? He says someone put engine oil in my transmission...the car was running fine BEFORE I got the oil change....the owner of pit stop came see my car to investigate what happened.....however when he got there he ended up in an argument and confrontation with mechanic...he refused take any responsibility for incident...and left me having to pay a second time to have transmission rebuilt...I'm very disappointed in the owner arguing with mechanic and refusing any compensation for a blown transmission....couldn't recommend this place to anybody...awful experience.