Milestone Credit Cards complaint: Double Payment

I made a payment for $632.08 forgot I scheduled that payment and scheduled an additional payment of $550. I only have a $700 credit card. Both payments processed and I over payed. I now had a balance for $1,182.08 and only a $709 credit card. I called and asked for a refund of the money I over paid they said they would send out a check in a 7 to 10 days. I never received the check and noticed every time I would make a transaction the cost of that transaction would be deducted from my credit card AND the balance of the money I over paid. I called again and asked why it was being deducted from both balances and that I never received the check.

They kept saying you have transactions pending and I explained to them several times if you add the cost of my transactions up it does not equal too the money I over paid I said you either need to deduct the transactions from the money I over paid and bring my credit card balance back to zero OR keep my credit card balance where it is and refund me the $550 I over paid.

My calls just kept conveniently being dropped. I have the names and badge numbers of multiple supervisors I spoke with and customer service reps. I have never had a late payment I’ve never had a missed payment I rarely carry a balance. I took screen shots of all my transactions and pending transactions that I can show as proof if you add all of them up it is clearly nowhere near the $1,182.08 I paid them. Please help