I am not from Islamabad, but honestly, I could not get PTCL to convert from ADSL to VDSL through their numbers like 1236 or 1218... I placed the order on 1236.. i nagged the twitter guy... I even complained on 1218. I finally talked with my line man and he said sir you need to get the modem changed yourself from the office. I had to go to their office. You should ask someone you know to do it for u.
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Few hundred to the line man... you know, that will work better than any complaint system of PTCL
Will give it a try!