hi folks.
a new u28 postpaid subscriber here
my main use of this line is just for the 4G data, as i already have another telco/line for sms+voice(no plan to discontinue this)
So for the last month, my data usage is just 800MB (i have wifi at home).

Do you think its a good idea for me to downgrade my u28 to prepaid umi20 and save the rm8 monthly?
Or do you think the rm8 extra is worth the hassle that i dont get my line distrupted the moment reach end of month/start following month just in case i forgot to get topup?

since i will only be using 1Gb or less data per month, im looking for any possible way i can save more/pay less.

Any idea combos/opinions are welcome