The phrase "whom I told" is correct and can be used in written English.
For example: "I had a strange feeling about the man whom I told about my secret plan."
"I didn't hear that, sir," said an affronted caller whom I told to fuck off.
Some people I know, to whom I told my plans, thought maybe my daughter would not get enough attention.
Three years without you, I miss you, the person to whom I told the secrets I wasn't supposed to tell.
The only thing I can't recall is whom I told I'd bring dessert when she invited us for dinner.
A friend called me after South Africa's victory in Bloemfontein, whom I told that – maybe – it'd be for the best.
"There are friends of mine whom I told about the e-mail notification," Mrs. Arena said, "and one said that she knew the night before about a two-hour delay the next morning".
My husband votes for whom I tell him to vote.
"I don't talk about it often, but sometimes youngsters whom I tell or who know about me just look at me".
Many terrorists whom I interrogated told me they expected America to ultimately fold.
But there were 90 or so schoolchildren in attendance, many of whom I was told were seeing their first play.
That isn't prejudice, a local estate agent whom I interviewed told me.
