Why don't they fix the Alcatel server?
They are fully aware of the issue but they don't know how to fix it. They had even flown Alcatel's engineer team from Bengaluru but they could not replicate the problem in front of the team. So the engineers left without doing anything.
The problem is sporadic and occurs during peak traffix period. Other times, it is less obvious.
Reading this forum and several member's complaints, it appears to be burst speed issue. All ISP's have burst speeds which exceed maximum speed for few seconds till the connection is throttled back. The Alcatel server has negative burst speed which throttles connection very aggressively.