Tandon, a former secretary of the party' city unit and a permanent invitee to Delhi BJP's executive committee, had sent his resignation in the morning to party President Amit Shah which was accepted.
However, Tandon later said he withdrew his resignation as "it was an emotional decision to quit BJP".
Earlier Delhi BJP chief Satish Upadhyay said Tandon's resignation letter has been accepted by the party's senior leadership.
"I resigned from BJP today because of Bedi's dictatorial attitude. It was difficult for me to continue under her," Tandon had said in his resignation letter to Shah.
He was part of Bedi's campaign team after she was named the chief ministerial candidate by BJP for the February 7 assembly election.
Tandon was general secretary of Delhi University's Students Union in late 1990s during his stint with BJP's ABVP. He rose through the party ranks and later became secretary of Delhi BJP when O P Kohli was made the city unit chief.