You are not covered in any way if you simply do your own thing

You could have used the bought as a guest function for the return 

Posting abuse  is not going to achieve a thing 

You don't get to do your own thing, fail to follow the correct process and then expect eBay to cover you

Nor is eBay going to read your abuse

If you do not know what you are doing, the time to 'ask a member' (which is what you posted under) is before you do anything