Payment Failed - RentNow process

I am having the same issue.
Made 3 payment attempts using 2 different bank cards for the Holding Deposit and they all failed. Contacted my banks and they have confirmed that the the money left the account and it is currently a pending transaction on it’s way to OpenRent. They advised me to contact OpenRent as they can’t help at this time. What can I do? There is no OpenRent phone number for me to call to get this sorted. Need help!

What I know at this time is that I just lost £600 and that I cannot secure the property!!

Screenshot_20190321-112842_Samsung%20Internet