Addressing protestors at Islamabad's D-Chowk, Imran Khan said the government's dialogue committee announced that five demands of the PTI have been accepted, Dawn online reported.
However, Khan said the government's dialogue committee was not giving in writing what it has accepted.
"The PTI leadership will approach the Supreme Court to get Sharif disqualified as he was telling lies on the floor of the National Assembly regarding the leadership of the PTI, Pakistan Awami Tehreek (PAT) and the army," Imran Khan said.
Imran Khan alleged that the government was also lying to the people of Pakistan about Chinese President Xi Jinping's visit because the latter, in fact, had no plan to visit Pakistan.
The Chinese leader was only considering a visit to Pakistan, Imran Khan added.
Imran Khan reiterated his stance that he would not leave the D-Chowk until Sharif resigned.
PAT and PTI members began their protests Aug 15 in an attempt to topple Prime Minister Nawaz Sharif whom they have been accused of rigging the 2013 general elections.
Since then, the protestors have continued with their sit-ins in Islamabad.