Peterborough MP says he has had no role in the firm since his election – but transparency campaigners say he must urgently "clarify his position".
Nigel Farage is already gearing up for another comeback, but it may be too late with his party in disarray.
Rhys Pilott, of Peterborough, told police he made the calls because he was bored.
Around 4,000 people were expected to take part in Sunday's Perkins Great Eastern Run.
Pictures of plumes of smoke filling the sky appear on social media.
Tory front-runner under fire over use of local candidate in launch video
“Lisa Forbes is a good woman. Not a racist in any way whatsoever.”
Both Corbyn's 'jobs-first' exit and May's withdrawal plan both look doomed, writes HuffPost UK political editor Paul Waugh.
The five things you need to know about politics today
Labour MPs have voiced concern, with one saying “it shows that anti-Semitism is becoming normal in the party”.
Nigel Farage’s Brexit Party has failed in its first attempt to put an MP in the House of Commons after Labour held off a strong challenge to pull off a surprise victory in the Peterborough by-election. Labour’s Lisa Forbes managed to retain her seat, beating Mike Greene into second place by 10,484 votes to 9,801 - a majority of 683.
"Whichever way you cut it, we’ve come from nowhere ... we’re pretty buoyed by this."
Labour's Lisa Forbes says "the politics of hope can win regardless of the odds" as Nigel Farage's party suffers defeat.
Bookies no longer taking bets on Nigel Farage's party getting its first MP.
More woe for Change UK as rival Remain parties stand their own candidates in Peterborough.
If 10% of her constituency back the bid, a by-election will be triggered.
Peterborough MP will stand as an independent after she was expelled from Labour over speeding offence.