It's better if you ask at telco talk session

But single NRIC only can redeem once at just ONE telco of your choice. So i assuming you also use Nric of your partner/spouse/family member?

Any the pakej perpaduan have almost same limitations no matter which telco. Its more to matter of coverage in your area, so i strongly suggest big 4 telco (so avoid yes or unifi Mobile at all costs if possible)

2 postpaid lines, maybe you go digi store to ask them whether can combine 2 lines into 1 main and 1 sub

300mbps need bundle with rm90 postpaid or above then can enjoy discounts

If you change to new postpaid 90 (1 line) then after rebate can get 300mbps at 100 per month for 24 months duration

More details can go to digi faq website page