IMHO.
Based on what Simba.SG provided on their website.
See the bold items below.
Ask them how they arrive at the $500.
You also can write to IMDA for help.
With the influx of $10 plans from other MVNOs, I think it is affecting them.
Get Your Lucky Mobile Number with SIMBA
- You can choose your Lucky Mobile Number online or via WangLei.
- Lucky mobile number reservation is for new SIMBA mobile plan sign-up.
- Number reservation is on a first-come-first-serve basis and upon successful reservation.
- All Lucky mobile numbers are sold at a discount of 50% (unless otherwise specifically stated for special promotions), and the price that the customer paid is after the discount is applied. The discount is provided to the customer on the condition that the customer continues with a valid mobile plan with SIMBA for a period of 24 months from the activation of the Lucky mobile number). The discounted amount will be chargeable to the customer if the customer requests for porting-out or the customer’s mobile plan is terminated for any reason whatsoever, before the expiry of the period of 24 months from the activation of the Lucky mobile number. The amount chargeable would be pro-rated based on the number of remaining months until the expiry of the 24 months.
- Lucky mobile numbers may not be resold, assigned or transferred to any third party, except with SIMBA’s prior approval in writing, which shall be subject to SIMBA’s sole discretion.
- SIMBA may change or withdraw the Lucky mobile number without prior notice to the customer, without being liable to the customer on any basis whatsoever, if such change or withdrawal is required by IMDA or relevant regulatory authority or any changes to SIMBA’s telecommunications network.
- These Lucky Number Reservation Terms & Conditions are subject to SIMBA’s General Terms and Conditions available at simba.sg. SIMBA reserves the right to vary these Lucky Number Reservation Terms and Conditions at any time without prior notice. The obligation is on the customers to refer to these Lucky Number Reservation Terms and Conditions, and continued subscription to SIMBA’s mobile plan shall be deemed as acceptance of such variation from time to time.
Source :
https://www.simba.sg/lucky-number