Since 2019 the same principle has governed how we handle support: somebody answers, whatever hour it happens to be. The live chat runs seven days a week with no overnight gap, and response times are generally measured in minutes rather than hours.
Nobody visits a contact page out of curiosity. You are here because a deposit has not appeared, because a document was rejected without a clear explanation, or because a bonus condition does not add up. In every one of those cases only one thing matters: how long before a person responds.
Below you will find the channels available, what to have ready before you write, and which route suits which kind of problem.