I own a licensed Auto repair shop with a valid res...

I own a licensed Auto repair shop with a valid resale permit. Rock auto claims to have a path for those that are exempt for paying sales tax. They Lie. Every time I attempt to enter my valid resale permit number, the same one I use to pay the sales tax I collect each month, rock auto says it is not valid...they lie, I hate liars. I would not be likely post this, but since they have no path to remedy this situation this is my only way to maybe get a response from them. Their system is broke and there is no way to get help to get it fixed. I will get my parts from amazon I guess, they know my permit is valid.