Velachery. They gave me about a dozen plans 4 Mbps and above. It didn't match what they had in their website. And the ones you posted weren't there in their list. I wrote to them enquiring if the plan is available and if yes switch me. And it happened.
Edited: to add, I had a 16mbps 50 gig plan at 2399. Now I have ACT 25Mbps 75 GB for 1299 and a backup airtel line 8mbps 40 GB for 1199.
So I now have a high speed but less reliable ACT line along with a more reliable airtel backup for around the same cost.