BIG Limited - charge

Hello,

I noticed a charge today from my savings account of $40 from BIG Limited. I have no idea what this is. I did some research and found that this company loans people money. We got 1 payday loan from the internet, but paid it back the following 2 weeks. We got a $200 loan and paid $280. I thought it was a little high, but its what we agreed to over the phone. We never heard from them again..until today.

I did a reverse from my bank and they said they will invesagate. The ACH actually says Affidav BIG Limited.. What does the Affidav mean? Did a court tell them they could start taking money 6 months after we thought the loan was paid for? What if the bank decides they can take it, we really don't have any proof we paid the loan. The loan was taken out of our checking account, an account we have since closed. The savings has the name number just with a different one at the end. Like 12345 and Checking being a 5 at the end or savings being a 0...

Anyway, how do I prove to the bank if I have to that we no longer owe this company any money.