Citibank Credit Card overcharging finance interest in Malaysia

Is Citibank credit card as well as other banks prone to overcharging the finance interest? A quick search online and I found several complaints in other countries but have not found any posting in Malaysia. Either nobody knew they were overcharging, or even they did experience it but didn’t made any blog post and thus no such info was found in the public domain.

I have been a loyal Citibank credit card user for so many years. I think I have been with them for more than 10 years. Still, loyalty count for nothing when it comes to customer service from Citibank Malaysia.