Autounion - Istanbul Sabiha Gokcen Airport Information, Car Rental Instructions & Policies

The service was mediocre, with language barrier being the first issue, followed by confusing insurance policies, and lastly, returning the car was extremely inconvenient. The rental company claims to offer full coverage, but scratches below 3500 RMB are not covered by their insurance, which means we have to pay for it ourselves. This insurance setup is really misleading! The Turkish car rental company also refused to take responsibility. I had already paid for full insurance through the rental platform in China, which turned out to be useless. They advised us not to buy insurance from local car rental companies in Turkey, but neither party took responsibility. If there's any incident, the Turkish car rental company only provides basic insurance. If there were scratches, they would immediately charge my credit card 3500 lira instead of freezing the estimated amount and waiting for the official repair assessment before charging the actual expense. Additionally, for car pickup, the staff picks you up at the airport and then takes you to their office, which is a tedious process taking about an hour! As for returning the car, they said they would send an SMS with the location, but as the return time approached, no one called or messaged. They later explained that their office phone's SIM card broke two days ago. It was really terrible. Time to drop delayed because the SAW office did not send me exact address ahead of time and nobody called/contacted my number which I left on the day I rented the car. After I called again and again both AutoUnion customer number and SAW office number, I was mad about what was going on there. Later the office staff explained their office number SIM card was broken 2 days ago and not working anymore but they did not inform me earlier. The second issue is about evaluating the damage to the car during my use for the past 7 days. Typically, the office charges a deposit fee to the credit card and after a thorough and professional evaluation for the repair within 2 months, then they charge me officially. But the office charged me today an extra TL 3500 besides the deposit of TL4500 on 9/26 for the damages/scratches to the doors within just 15 minutes. I suggest they handle this in a more proper manner. How can I know if the charge from the SAW office is correct? What if they charge more than the repair expenses? It’s unreasonable to do so.