Zhang San entrusts Li Si to help maintain the car (with tickets). Li Si accepted the car dealer's suggestion and helped Li Si increase the maintenance fee. Zhang San refused to pay. Zhang Cansan refus

Zhang San entrusts Li Si to help maintain the car (with tickets). Li Si accepted the car dealer's suggestion and helped Li Si increase the maintenance fee. Zhang San refused to pay. Zhang Cansan refused to pay? Hello, I feel it depends on the project entrusted by Zhang San. If Zhang San entrusts Li Si to maintain the vehicle for him, Li Si has the right to help him. If Li Si is entrusted to carry out routine maintenance, Li Si will take the initiative to carry out maintenance without applying to Zhang San, and Zhang San has the right to refuse to pay. This is my personal understanding, I hope it will help you. I suggest consulting a lawyer. After all, it's not good for neighbors to be too stiff. It's best to settle it through negotiation. If the maintenance items really need to be changed, it is recommended to pay Li Si.