It is usually better to ask for support from the staff, but then also write to their social media and here to get attention, I do not support that because it creates a lot of workload for the people who are already looking into the problem, there is no reason to pressure them like that, but at the end of the day there is a reasonable approach if you are not getting responses fast enough, that added pressure will make sure that you would get your responses quicker.
Just don't do it after a few hours, because that’s normal, if you don't hear from anyone over 48 hours, you could start writing here and on social media to make it faster and quicker response.
They usually have setup social media for updates and promotions to the audience but yes you can still try to contact them through this way also but it will be directed towards support to open up a ticket and then issue will be resolved.They take 24-48 hours atleast if withdrawal issue is there or more in some cases also but if not responding they can definitely share it here to help them out of the problem.