Avis car rental gave special rate move suv to Orlando When p/u price twice as much and on delivery another 50% Pittsburgh Pennsylvania

Went by air to Pittsburgh and because of possible cancelation going back, I arranged a rental car from Avis going back to orlando.Wanted a low price car and sales lady said if I would take a suv back to Orlando I would get a discount. She gave me a price of $59.00 for 2 days total taxes included. This was 09/08/17.

I came in on 09/10/17 and another lady wrote up aggreement with referance # I gave her. the bill came to $86. 41 and I said where was the discount and I asked for 24 hours instead of 48. She said I would have to talk with Avis in Orlando .I was a fool, but I trusted that she was being honest with me and signed for #16.50 for insurance only. 

I had car to deliver within 24 hours and Avis said would have to bring it in next day and I would not be charged. Stayed in motel and took car back next day 09/12/17. got bank statement and they charged me $186.00. Called customer service and they put price at $90.00. Said I signed for it so will have to pay it. Their special rate for doing them a favor was $90 dollars for 1 day. 

I really thought I could trust the Avis agent as they are a large company. But I was wrong , costly lesson do not trust using Avis for any thing.