The family of a British-US national who they expected to be freed by Iran last week as part of a deal with the UK has gone on hunger strike, they say.
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Morad Tahbaz, 66, who also has Iranian citizenship, has been confined to a hotel, the Foreign Office has said.
His sister Taraneh told the BBC his family was "absolutely distraught" and feared he would be forgotten about.
The Foreign Office says it is continuing to lobby Iran at the highest levels for Mr Tahbaz to be released.
Hopes had been raised that Mr Tahbaz would be freed when Nazanin Zaghari-Ratcliffe and Anoosheh Ashoori were released and flew back to the UK on Thursday, but he was returned to Evin prison on Friday.
The Foreign Office said it had been informed by the Iranians this move was in order for Mr Tahbaz to have an electronic ankle bracelet fitted. On Sunday, the Foreign Office said he had been moved to a hotel in Tehran.
Appearing alongside Mrs Zaghari-Ratcliffe at a news conference on Monday, Mr Tahbaz's daughter, Roxanne, said the family had been led to believe her father would be released with the other dual nationals.
"From the outset, we were always assured by the [UK government] that my father would be included in any deal that was made to release all of the hostages.
"So we're truly devastated, knowing now that this was not the case."