Contact Starbucks88
Three channels, all staffed around the clock, all in English, Bahasa Melayu and Chinese. Live chat is the fastest for anything touching the cashier, because the agent can see the transaction while you are describing it.
Which channel for which question
Live chat for money: a deposit that has not landed, a withdrawal that is slower than about five minutes, a bonus that did not attach. The agent has the transaction in front of them, so these are usually settled inside a minute.
WhatsApp for anything that needs a screenshot, and Telegram for anything that is not urgent. Both reach the same team and the same history, so a thread you started on Telegram last week can be picked up on live chat tonight without explaining it twice.
What to have ready before you ask
For a deposit: the amount, the rail you used and roughly when you sent it. For a withdrawal: the amount and the time you requested it. That is enough to find any transaction on the floor, and an ordinary question needs nothing beyond it.
If a payout has gone to manual check because it is above RM18,000, support can tell you where it is in the queue but cannot move it, and saying so is more useful than a promise.