Payflex wouldn’t refund my money.

I paid 3 times cos of their system glitches that happened on the 27th of September. I have been trying to get my refund since then but no luck. What a horrible customer service l have experienced from Payflex. They don’t respond to emails and the agent I spoke to today promised to call me back but never did. I have given them all my details including bank statement but to no avail.