Monteith Tire of Goshen

Me and my hubby went to Monteith Tire of Goshen, Inc. on May 7, to have my car's passenger rear brake checked because it was making noise. They offered us a brakeline flush for $89, but we said no many times. My hubby told them that we would think about it when we get our front brakes fixed. But they still did the flush without our permission. "Joe" told us many times that they would charge us for it later, but when my hubby got mad, Joe said he never said that. We asked to talk to the manager, but Joe said he was the manager. He even said he would put the dirty brake fluid back in the car. They did something we didn't want them to do, tried to charge us for it, and then called us liars. They said they would deny it if we reported them. We didn't pay for the flush, and we're worried they might do this to other people too.