Merchant's Tire and Auto Service Center

I called Merchant Tire located in 100 Town Village Dr., Cary, NC 27513 in April to get a cost estimate on installation of the tires if I purchased the tires from TireRack. I was quoted $132 out the door price my car with TPMS. The price included installation with TPMS, lifetime rotation and balance and all shop fees, taxes for 4 tires. I verified this twice with two different representatives, once in the morning and once in the afternoon. I placed my order with TireRack the same day. When I went to have it installed, the representative (Rodney) spoke rudely and with arrogance and he asked me for $181 for the same service. I told him that I verified the amont before and was told $132. He refused to agree and came up with multiple excuses. With every response he tried to express that I do not know anything about my car and as if I am wrong in any/every statement I made. When I told him that I need a day to think about it, he asked me to take the tires away and this is what I get for ordering them from TireRack. He pretty much left me stranded at the last minute, taking benefit of my situation. I am an old customer of Merchant Tires and have not recieved a bad service like this before. Is this the customer service to be expected from Merchant Tires going forward ... to put down a customer and behave with arrogance and rudeness? The take the benefit of the situation and over-charge the customer?