The car loan guarantee company borrowed 7000 yuan more without my knowledge.

Please find out whether all the loans have been given to you. If the guarantee company misappropriates it, it is theft. You can sue for unjust enrichment and recover the misappropriated money. If the loan money has actually been used by you, but you have lost interest because of excessive loan, you can recover the loss from the guarantee company. If it is a personal loan, bring your ID card. It is recommended to go to the loan bank to copy the loan contract and repayment details to understand clearly.