"BJP had issued a whip to the party members in the committee to vote for the official candidate of Sena-BJP combine Pappu Kadam. However, Joshi instead voted for rebel Shiv Sena nominee Shailesh Bhagat backed by the NCP-Congress alliance to get him elected as chairman of TMT," the BJP said in its communique to Joshi.
The letter was subsequently made available to media.
Meanwhile, Deputy Mayor Milind Patankar who had resigned from his post after being manhandled by BJP-Sena alliance functionaries for his alleged role in provoking its member Joshi to support NCP and Congress-backed Bhagat has resurfaced in the city.
Patankar was "missing" since he was roughed up on December 23.
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Meanwhile, for elections to the office of Deputy Mayor, BJP nominee Mukesh Mokashi, who was allegedly at the forefront in the attack on Patankar, has filed in his nomination.
Mokashi has reportedly sought anticipatory bail from a court fearing arrest in connection with the attack on Patankar.
The election for the post of deputy mayor will be held on January 8.