I was using PTCL Evo (the 1GB package). It suddenly disconnects and when I try to re-connect, it says the username and password are incorrect whereas I haven't even touched them (both are default, i.e username:firstname.lastname@example.org and password:ptcl). I haven't run out of the limit since it would charge extra money.
Can it be that it has completed 1 month ? Or what is the problem?