Safety hazard - drive through

I am still shocked and traumatised after a machine (apparently an air-conditioner) blew fine mash potato powder at high speed in my face and all over the dash board and seats of my car, while paying for a meal in the drive through! My experience with this branch has never been good, but usually it is poor service, waiting times and security. I'm sorry, but an apology is not good enough! I suffer from allergies, and I wonder how KFC would have responded if it was boiling water or another hazardous substance flying through the window? It seems that KFC don't need the business of Milnerton proper and Royal Ascot, because I haven't heard anything good about that store. I don't think they will ever see me again. Enter their drive through at own, but great risk!