Is this slander?

I work as a tire technician at a retail store.....a Few months ago i was pulled into the office and disciplined for parking a car and not torquing the tire on a vehicle in accordance with company policy,in which the customers tore fell off down the road. The manager gave out the information that i had done so to many associates in the store. As the weeks continued i had many jokes by associates as well as customers refusing my services "because they didn''t want their tire falling off." my name soon spread to other stores due to a break in confidentiality. My reputation as a tire tech has been ruined.not because i didn''t follow policy but because i wasnt even the one who parked it and not follow policy. I asked management to review the tape and they said that was correct that it was not me and they would fix it. Its been a month now and everytime i bring the subject up they say there working on it. Is this not slander?