I am using Hotlink 365 feature, I am seeing 10sen getting charged on my account until my credit went 0. The explanation I got from the customer support line is that 10sen will continue to charge on me because I am using the old plan and each time I am in Maxis coverage I will get charged despite my data is not on.

Can anyone explain what is going on?

My phone has my data off the whole time. If there is usage, it would not be just 10sen ba. GPRS is charging 10sen per 10kb, and my normal internet usage is not just 10kb. The response I get from Maxis is that the 10sen will continue even your phone data settings is off, because the settings is on 4G and you are in 4G coverage.

The option to prevent this charges is:
1. change settings to 3G
2. request to terminate data completely from Maxis.

Charging 10sen when data is off is not acceptable, and the method of changing from 4G to 3G to avoid this charges is not being given to customers (unless you kena charged kao kao and you call support to investigate).