I manage to downgrade from MOP98 to Hotlink Flex

Process is

Downgrade from MOP98 to Hotlink Red for min 1 month (6 month if your MOP98 is less than 1-2 years I think)

In order to maintain unlimited call (but no unlimited sms) and 8GB data (compared to 15+15GB data), top up RM60, buy the hotlink red pass. This is the closest u can get similar to MOP98 plan.

Then, exactly 1 month change to Hotlink Red to Hotlink Flex

All done by an agent here in LYN, no need walk in to Service Center wait, no need to wait for their call.