Do you have written authorization from the other party to use his factory name or trademark, or have you signed a relevant agreement? If there is an agreement, it is not an infringement. Or, have you ever paid a reasonable royalty to the other party in the process of using the manufacturer's name and trademark? Yes, collect relevant proof of payment. It is best to prove that the other party recognizes that these fees are fees for the use of the factory name and trademark. You should need to find proof materials like this. Also, what does the plaque say? Is it something like you being the "exclusive distributor" or "general distributor" of his manufacturer? Is there any signature, official seal, or other signature of the other party? Maybe it can be used as evidence. (My humble opinion, I don’t know if it helps.)