Beijing and dealership's horrible service

I purchased a BAIC X55 Beijing Premium line in June 2025, since then i have been having issues with the car and the dealership that doesnt care about their customers but more about making the sale. The day i collected the car there was no spare key and since then im waiting for the spare key, the rubber on the side back passenger is crumbled and i showed the service manager, sales agent and the manager and till date im waiting with no responses from them. The day i bought the car i asked for the back tyres to be replaced as its worn out and the manager said he gave me a good price so he cant change the tyres, the stick on the car has a fuel consumption of 7.1 or 7.7 however its around 9/10 this is all bull**** and people just want to make a sale. At times they car senses when you nearby then it unlocks other times it doesnt, the car at times drives without the seat belt on in reverse it rolls. i was told all this is normal but i cant even justify it. the first time i bought the car there was a huge noise coming from the front of the car as well. i always loved a Beijing from the time i saw it but now i whole heartedly regret buying it because of the issues im having and the service im receiving.