Unfortunately you won't be getting that value as Samsung trade-ins are pretty shit outside of US. You can gauge your latest trade-in value here https://www.samsung.com/my/offer/mobile/trade-in/ or with the InstaCash app, which is what Samsung uses.

Best case is getting extra rebate from trade-in promo. Example Z Fold 3 had an extra RM500 rebate if you trade in, and I had a non-functional Note 8 which had RM1 value, but I could still get the RM500 rebate even if I traded in the phone.
RM500 value for a dead phone is good, but I decided to save it to trade in for S22 Ultra

how?

i think the best deal will be buy through lazada with Lazada citibank card which give RM600 discount. (if you don't need instalment plan)