If for some reason you did not save the link to the accounts when paying via Bitcoin, you always have the opportunity to get it, having Transaction Hash. How to find it out?

When paying with Bitcoin, we ALWAYS provide an address to which funds should be sent. This address is unique and is used only for your payment. With this address, you can get the transaction hash on the Blockchain website

After you have found the hash you need go here and get a link to the purchased accounts.