Avis Podgorica Charged Me €461.48 Instead of the Agreed €241.41

I would like to report serious problems with an Avis car rental reservation I made for Podgorica Airport in Montenegro through the Turkish Airlines mobile app. My reservation number is 1870388TR4. I reserved a Renault Clio for five days, with pickup on July 3 and return on July 8, for an agreed total price of €241.41.

Although my contract and reservation clearly listed a Renault Clio, I was given a different vehicle from Dacia at the airport. In addition, despite having a five-day reservation, I was charged for seven days. Instead of the agreed €241.41, Avis charged me €461.48 for the rental. An additional €300 security deposit was also charged to my credit card, forcing me to pay nearly twice the originally agreed rental price.

The behavior of the Avis employees at the airport was also extremely unacceptable. Even though they could see that I did not speak the local language and that I was trying to communicate through a translation app, they refused to assist me. They made the process unnecessarily difficult and attempted to push the transaction through without properly explaining the charges. They initially tried to charge my card €1,500 and were unable to do so only because my available credit limit was insufficient.

I trusted the reputation of Turkish Airlines and expected a transparent, trouble-free service when making this Avis reservation. Instead, I was deeply disappointed by the vehicle substitution, incorrect rental period, excessive charges, and behavior of the airport staff. I am requesting a full investigation and refund of all excess and unjustified charges, along with a detailed and satisfactory explanation.