Terrible *********** company

I am highly frustrated. This company is *********** your staff has no clue what is going on you call 10 times a day. My acc was duplicated on my itc I called in for this to be rectified I was told it can't be done after calling several times I was told it's updated. I then paid up the amount owed so that I can get my new car to find out the false account still shows on my itc. Now finchoice if you do not rectify this mistake I will take this further you are ruining my credit score because your company is ***********. I asked for two paid up letters or a letter stating the mistake that the one account was a mistake no luck all your sales people say I must wait 21 days for it to clear. Now my question is why must I suffer for your lack of workmanship. I will not allow this I will be taking this further now because of you I cannot get my new car!