It seems so. Because TM do not allow 2 services running at the same time on their infra. That's why nowadays cannot run Maxis and Unifi at the same house anymore.

SG Broadband penetration rate is already over 90%, IPS have to find a way to sell more broadband 

And actually no point to have same broadband service in a same premises, when it is down time both also down. You can apply 2 different ISP in a same premises in fact.
example Unifi + TIME

Forget about Maxis, because most of the time Maxis are using Unifi infra, unless Maxis do have their own infra in your area.