Thanks again for the info @factsdontcare. I'll make sure to keep an eye out on return debited from my account.
The seller is telling me customer service is applying a refund to both of us and no.item needs returning. ? Doesn't make sense to me . Interested to see how the solution is dealt out.
It makes sense since it would have cost more money (for OffferUp) to pay for return shipping, in comparison to letting you keep your money from the sale.
You will not be getting your pants back.