Bukit Batok voter asks if caretaker MP Desmond Lee is lying about David Ong

The following is a letter from TISG reader, Janis Z.
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I am a resident at Bukit Batok and I received this letter in my mailbox from Jurong GRC MP Desmond Lee. The 2nd line says David Ong "has apologised deeply to residents for having to resign prematurely."
I don't remember him doing so. Did he? If David Ong didn't apologise, Desmond Lee would be lying to the residents. I haven't heard or seen any apology from David Ong thus far.