Just experience my first network distruption. When it works, it is good, when it down, means down and no help except submit form at the website. The Whatsapp is only for appointment and sell equipment.

~12.00 just disconnected.
Restart & troubleshoot, didn't work, message Whatsapp number and pointed to the website:
"Hi, You may raise your enquiries and feedback thru SIMBA Telecom Website > FAQs > customer support team.
Select Broadband under the drop down list.
The customer service agent will get back to you.
Thank you.
"
Spend a while looking for that menu and finally found the form & submitted the form.
Looks back at the computer and it is back online already.
Here is the link:
https://support.simba.sg/hc/en-us/requests/new?
It isn't easy to navigate on the phone.
12.55 =>Back online (almost 1 hour), after a few re-boots and restarts.
When it works, it really good.
Conclusion: Don't sign up yet if you are doing mission critical or have unlimited mobile plan standby.