yea this is my biggest problem with simbayes but when you renew it eats into your suspended period so you only get the remaining days left, therefore wasting money.
for simba your renewal date is fixed. so it is not like eight where you still get the full 30 days if you activate a new plan later
e.g. if you suspend (non payment) the plan for 20 days, your plan renewal will only renew remaining 10 days.
1aug (suspended) -> 20aug (renewed) -> 30aug (plan expires)