Depends. If the check states "full payment" or "full satisfaction" or "payment in full" or the like then the merchant is attempting to tender an accord and satisfaction check, which if cashed would finally and fully resolve the dispute between you and the merchant (UNLESS you are in Oregon, where the rules have been modified by statute).
If you believe that you can successfully win a CC dispute, then you may be better off filing the dispute for the full amount before attempting to cash the check -- tell the CC issuer that you were given a check for 70% of the transaction amount and see if the merchant suddenly produces a "restocking charge" agreement that you purportedly were held to. May be a good idea to state in your dispute letter that you were not informed at any time, nor was there anything displayed at the merchant's establishment concerning any restocking or other restrictions on returns.
Okay, so it appears that your contract with the seller was based on your understanding that you would resell the items, and it turns out that you cannot. So, the contract itself is the product of a mutual mistake of a basic and material fact, which the reseller should reasonably have known about and which would entitle you to rescind the entire contract by returning the merchandise.
I think you're on pretty solid ground here for a full refund, because the seller should never have sold you the goods in the first place -- which is why he wants his name left out of it.
You're not going to be able to get any sort of relief from the credit card company if the seller refuses to deal, because the Federal Truth in Lending Act only applies to "consumer" transactions -- not to commercial transactions. So, the credit card issuer can just say "tuff luck" to you. Not saying that will happen -- but if it does, you're stuck.
You can't tell the seller that if he doesn't pay the rest of the dough that you'll tell the manufacturer what's up, because that is extortion (criminal). All you can do is tell the seller that if he doesn't pay the remaining money, you will be forced to sue for the difference.
The "25/fe" means nothing to me -- it certainly doesn't indicate an accord and satisfaction check. I don't really know what it means. But, you can call up the seller and ask...
If you want a thorough review of your letter, you MUST retain an attorney in your jurisdiction. That said, you should be very careful not to imply some threat in your letter if the merchant does not pay you back. That could get you arrested for extortion.
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