Must the RM2 spend be accumulated from a single call or can I accumulate it from multiple calls made between 9AM to 5PM, i.e. RM0.70 at 9.30AM and RM1.30 at 2PM, in order to qualify for the FREE all-network Calls?

As long as you spend a min of RM2 on local Calls between 9PM to 5PM, inclusive of single or multiple calls, you are entitled for the FREE all-network Calls.