1) Do they charge you (brokerage fee/clearance/stamp duty) if you cancel an order on que?
2) Trust account and Available trading limit ... if you deposit 10k ... what is the available trading limit?

[Mplus]

If I trade using cash upfront (Deposited 5k to Trust Account)

Does it automatically pay the settlement due for me? (T+3)

Cause it seems that my trust account increased with a huge amount (I think they just added the sale proceeds amount without deducting the settlement amount)

For each transaction, I need to manually make payment using my trust account?

Also, If I don't pay within T+3, is there any penalty? Like interest charged or something?