why still don't read the t&c ?

already stated in there clearly.

yes, I threaten to cancel the card. they block my card once I request to cancel. Few days a cs called me to offer waiver when I do 3 swipe in 60days and rebated was in within 30 days.

since I request to cancel, they temporary block it so no further transaction on the card. Once the cs called to offer rebate, they will unblock it when you accept their offer and continue to use the card. if you insist to cancel it...they will cancel and you no longer able to use that card.

For all the above to happen, you must clear all your outstanding before request to cancel card.

I successfully waived my UOB YOLO Platinum SST with NO Extra Condition by just calling CS and tell them i wanted to request for SST waiver. Then the CS say ok and proceed to my request. After 8 days, they reversed back the SST as Cash Back.     

NOTE : My Service tax was charge on 5/12/2018 and I requested for waiver on 01/04/2019. This is NOT April Fool Joke    

Another succeed case for SST matter.

Back in Sept/Oct last year I already paid for the SST and recently there was a discussion regarding UOB will credit back the amount even if paid long time ago.

I tried my luck by calling CS on last Friday and CS said will put in my request but subject to management's approval, I just logged into UOB app and saw RM 25 credited back to me on yesterday. Description is  "Service Tax Cash Back".

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which post suggest otherwise?
if merely topup ewallet RM 1,000, TNG charge u RM 10, u will be left with RM 5 only

SHELL CASHBACK CAMPAIGN for nov and dec is credited.