I am sorry man, they did suck!

Most of the maintenance were not necessary, in my oppinion. They screwed you for your money. Now the quetion is what to do next. I would take it to anther shop and get it checked/repaired. Then take the invoice and go back to that MxxFxx shop and ask for a reimbursment of that money. I would not tell the second shop about your unhappy experience before hand. After the car is checked or fixed, then ask what they think the cause. After you get your car fixed, google online, find out "the best business bearu' phone number, local claim court info---in other words be prepared before going back the BigOtire again. Then tell them, if they don't reimburse you, you will complain and take them to court.... Good luck man!
BTW--next time, you replace your onw windshield blades, air filter, and refill the water. Leave your transmission/brake fluid alone unless they break...