Innovative Merchant Solutions - INTUIT Company I process refund with paypal. But when I open account, they process same refund again. woodland hills, California

1. Buyers made a payment throught paypal with their credit card. But buyer informations were wrong, so I process buyers refund throught paypal on August.

2. I opened account with Innovative merchant solutions on 9/1.

3. Then, they processed same refund again. I complained, " this is double refund".
They just process refund , they didn't process buyers credit card charge.

4. Also I didn't request refund with them. I claim this charge and my Bank refund.

5. But now they request full payment, $2,18.35 + additonal cost.

* How can I and where I can file claim?