I got to the last step of an SE but ran into a slight issue

[MaciejHakherinho]

I recently SEd a gaming chair with the sponsorship method. I got them to agree on my deal but I made a mistake. I used my address. This wouldn't be a problem if they didnt make me sign a contract in order to get the chair. The question is, should I sign the contract? I used a fake name an everything, but it was the address that was my one mistake.