Discovery *****ing my money

After 7 months of trying to get Discovery to pay me back my money for services done in December 2017, of which they deducted the amount from my MSA of 2018 after there were provisions made in 2017's benefits in my health plan to cover these type of payments in the event that the 2017 MSA is depleted, they have still not paid back any amount, after admitting that they are in the wrong. Numerous phone calls from one person to the next each with different stories and promises each time, not to realize every time. Poor customer relations, they don't follow up with you to find out if things were resolved or not. Worst experience ever.