Double debit and poor communication.

I've been using Payflex for quite some time now and never had any issues until recently. I made use of the payment option for deductions to be made on payday. On the 23rd of Jan, they deducted a double payment from my bank account. At that time there was it one purchase on on Payflex account. I've been trying to get in touch with someone but their phones keep on ringing or you get a message that they can't answer their phones due to high call volumes. I've also send two emails with no response.