I also faced this issue at BHP last week but I've not been to any other merchant that has Paypass so I can't tell if the NFC got issue or it was just the BHP terminal I was using.

You'll only get 0.2% cashback under other category.

The one I tried was via Yes Selfcare to be eligible for RM5 autodebit discount and I only got 0.2% rebate. Perhaps you can call CIMB CS to find out some way to get the 2% but for me, the 2% is a lot lower than RM5.

Using PBB Petron for 0.5% cashback but that'll drop to 0.2% end of this month.

They're afraid of getting scolded by you and most agents and even supervisors in contact centres don't know the concept much less how to actually make the calculations. The concept is as follows:

Since you did not pay in full by the due date, you lose the 20 days interest-free benefit for all transactions shown for statement date 28 August so you'll be charged interest for the following:

1. All transactions listed on statement dated 28 August
2. All transactions listed on statement dated 28 September
3. Additional finance charges up to the due date for statement dated 28 September to avoid the situation of not being able to zero the statement balance despite paying the statement balance in full before or on due date

Due to the daily compounding interest nature for conventional credit cards, even small carry forward balances can add up much faster than the advertised 1.5% per month rate.

This is relating to the card acquirer. If the transaction is RM but the country shown in statement is not MY, you will certainly get charged cross border fee for CIMB CC. But I'm not certain for non-RM transactions for non-MY countries since haven't personally performed such a transaction myself yet. Perhaps someone else can confirm this but it's a bit tough since the usual forex charges and cross border fee isn't shown separately.