Eddie Hearn has urged Deontay Wilder to "stick to facts" after the American questioned why a unification fight with Anthony Joshua had not been signed.
The WBC champion is yet to sign a contract for a fight with Joshua for all the world heavyweight titles, despite being sent terms by Hearn last week.
And the Matchroom Boxing boss has responded to fresh criticism from Wilder about the ongoing negotiations between both teams.
"Let's just stick to facts. We made them an offer firstly, they didn't even reply," Hearn told Sky Sports.
"They made us an offer, we asked to see a contract, they refused to send one. We made them another offer, after nearly four weeks they accepted and asked for a contract and we sent them one. If they want the fight they will sign it."
Wilder had previously labelled himself a "true champion" and insisted he would be willing to sacrifice immediate rewards in order for the fight to go ahead.
Hearn though is unsure of Wilder's mindset while admitting the WBA are in frequent contact about a mandatory title defence against Alexander Povetkin.
"I can't quite make out whether people are lying to Deontay about the negotiations or he is just completely deluded.
"I saw an interview with him yesterday saying he is actually two people, Deontay Wilder and The Bronze Bomber so I'm siding with deluded. It's not complicated - we have set out the terms of the deal, we put it in a contract and sent it to him.
"He has now had the contract a week. We are getting calls from the WBA on a daily basis asking what's happening, there is absolutely zero urgency from Deontay and his team other than posting silly Instagram videos.
"The proof is in the resumes and at this stage I believe Deontay and his team do not want this fight."