Updated Today:

Since I saw this thread is still active, I'm interested to share also. I've been using hotlink since 2002 and until Nov2010 I've decided to switch to Digi. While using maxis at that time, I kinda not satisfy with TAC receive since its quite delay. Some more I have to call somebody or dial check balance just to make the TAC receive fast. It did. But when it comes to an urgent matters, I kinda fed-up when I have to wait quite a long time to receive TAC number. Then on November 2010 I switch to DIgi. I can confessed that this operator is a bit faster on receiving TAC number rather than Maxis.

Then out of no where, I tried to switch to Celcom (prepaid also) just to give it a try after using Digi for about 7months. On one end of the spectrum, I can conclude that Celcom receive TAC is quite fast and I can say less than a minute. I have no problem at all receiving TAC number when I'm using Celcom. Although I saw many complaints especially on maybank facebook saying that Celcom always having problem on receiving TAC. But not in my case.

Last 2 days:

I've planned to switch back to Hotlink since I'm using smartphone and I need better package. This morning, I've started changing my simcard to Hotlink and what really2 disappoint me is this TAC problem.
I've got "better package" EXCEPT this silly tiny problem. I've contacted Maxis, they told me that its Maybank problem if its regarding about TAC request. Then I called Maybank explained them from A-Z. He told me that he will call Maxis since its between Maybank&Maxis. No point if I complaint directly to Maxis. After 2hours, that maybank guy called me. He said that Maxis currently having problem regarding about sms TAC. He also didn't know how long will it takes to fix it and he promised to call me once its fixed. Problem on a first day using MAXIS...