please someone help me, tell me how to correct this.

when i use my mtn sim in my modem to browse, on my laptop, i cannot access twitter.com
it tells me internet explorer cant display the page. same thing on chrome, same thing on mozilla.
i tried doing nslookup for twitter.com on command prompt cmd, it says server failed.
but i can access every other website using my mtn.

I changed to a glo sim on my modem, on still d same laptop, i can access twitter.com comfortably plus other sites.

Problem now is i have already spent 8k for 5gig mtn subscription, so i cant change network and i desperately need to access twitter.com

how can i correct this problem on mtn?

av called mtn customer care, they have no clue.

av times without number cleared my internet history, shut down, restarted laptop, it still doesnt work.

please help!