Chat is broken - what to do?

[rarther]

TLDR: phone the number on back of bank card

Need to send a large sum of cash - no response in chat

Hi guys I am in the process of buying a house and need to send the deposit for the house to the solicitor today, was chatting to someone to lift the limit for this one off transaction, this person suddenly stopped responding and now has disappeared for the last 3 hours. I need this to be resolved today in order to get the solicitor to process the contract exchange. Please help?