Legal analysis: Unless you can prove that the goods you provided have been delivered to the other party, the court may not file a case only based on the witness testimony of the driver. If you have a signature, it proves the fact that you owe money and can be used as evidence to sue. If the customer does not pay back the money, he can directly sue the people's court for his behavior, and he needs to apply to the court for a payment order based on the purchase and sale contract signed by both parties.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 667 A contract is a contract in which the borrower borrows money from the lender, repays the loan at maturity and pays interest.

Article 668 A contract shall be in written form, except as otherwise agreed between natural persons.

The contents of a loan contract generally include terms such as loan type, currency, purpose, amount, interest rate, term and repayment method.

Article 669 When concluding a loan contract, the borrower shall, at the request of the lender, provide the true information about the business activities and financial status related to the loan.