oil change

I had oil change by this rip-off company today. I am very angry. They had a sign out front that said "today only oil change $26.99" I fell for it. When they got my car in the bay, i was told it was $69. I stated I did not want to pay that much. several employees came in one at a time and told me various stories such as we will give you a discount or how about $30. i agreed to the $30 but 45 minutes later. Nathan came to the desk and said it was $69 and that was the discount. not only that they could not change the oil filter because the dealership put it on too tight so I would have to go back to dealership to have oil filter changed. I payed them but I was very angry. I called back and asked to speak with manager. Both Nathan and Julio claimed to be the manager. After i got angry, then I was told Randy Martinez was the manager but he was on vacation. I plan on writing negative reviews on every site I can.