I've always found online chat to be a better service than phone service, even in companies that have both options.In every case these were quickly and effectively sorted out by Revolut using there online chat service.
This was better than the telephone service offered by other banks, which usually involves long wait times for an agent to answer
An honourable exception being Ulster Bank who usually put calls through to their knowledgeable Belfast call centre. The rare times the call went to my branch for some reason were a disaster.