That's just glorified VOIP. If there is a problem in the backbone, you are screwed.
LOL! But for now, we can only speculate if that's how they're going to do it.
Attainable rate is 14628 kbps downstream. I actually mentioned that to Airtel and persuaded them to give me 8mbps. The guy who spoke to me kept saying the same thing like a broken record. The bottomline is they can't give me 8mbps. I'd get a disconnection as a protest if only I had an alternative here.
Then they're just trying to be safe. Persistence, I think, is the order of the day. Try to contact their technical team, if you can & find out what they say.