Urgent: Problem with Mtnl Broadband

Messages
1
Location
NA
ISP
Mtnl
I am having strange issues with my mtnl broadband for 1.5 months. Problem goes like this:
Dsl remains unstable most of the time. I contacted mtnl guys, they checked the line and found no issues, i got the modem replaced too , splitter etc. But sometimes it works entire day and suddenly starts going down, dsl blinks fast but don't get stable , sometimes if i attend any call on landline it becomes stable but not everytime.
What's the issue i am really fed up now, modem ok line ok splitter ok then whats the issue?
 
looks like Line issue.
do you hear humming or any static interference while using phone call ?

search, other members have been discussing similar issues for few years with pin pointing the exact causes.
 
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