Anybody in the past had this issue??

Level 1
I sold an item on offer up. Item weighs 20lbs. I chose the option 10-20lbs weight and it gave me a USPS shipping label that says only 15lbs. They won’t take item at my USPS. They charge way extra. Because of that label. How can I change the label to a UPS 20lb label. Usps is hard to deal with.
Hi, if you went in person I would suggest asking for the supervisor and explain to them as calmly as you can what happened on OfferUp. Then get in touch with OfferUp and explain their mistake of false advertising. They should respond. if no one is cooperative call the Better Business Bureau to issue a complaint. This may take time, in the meantime, call the state of Connecticut Attorney general's office and explain your situation. Hope this helps