Lady C (who appears to have two accounts posing as official pages on Twitter) claims that Duncan shoved her while filming for the reality show's spinoff I'm A Celebrity Get Me Out Of Here Now!.
Referring to the incident on Twitter (@LadyColinCampb), she tweeted: "Thanks 4 supporting Dima and me when Duncan physically assaulted me on TV and him at the base camp. Police came but haven't pressed charges."
Her other account (@LadyCCampbell) makes no mention of the fallout, but despite the confusion, Duncan has outright denied such claims and has told fans no police call has been recorded.
One user asked Duncan if he had meant to "barge" Lady C out of the way at the end of the show, but the Dragons Den star replied that he had no idea he had done so.
He replied: "Of course not. I did not even know I had until it was mentioned on Twitter."
After hearing Lady C's latest claims, some of Duncan's fans made sure to show him their support, with the 66-year-old then suggesting a call had never been made to the police - despite Lady C implying it had.
He told them: "Police have told us that no such call was made."
@StereoChick93 of course not. I did not even know I had until it was mentioned on Twitter.— Duncan Bannatyne (@DuncanBannatyne) December 7, 2015
Duncan's tweets come after an insider told The Sun nobody had seen what had happened between himself, Lady C and Dima.
They said: "Nobody saw it happen and just heard Dima yelling about it. But then it kicked off. The pair had a verbal stand-off and were shouting all sorts of things at each other."
News of Lady C and Duncan's latest fallout comes after she claimed he and Tony Hadley had 'bullied' her during her time in camp.
After shockingly quitting the show due to medical grounds, Lady C later said the pair had "ran her out of camp", but ITV have dismissed such claims Lady C was bullied, with both Tony and Duncan denying having done so.
Duncan says on tonight's Coming Out Show: "Lady C knows she wasn't bullied. There was only one bully in camp and that was Lady C. She really is very silly."
Tony, meanwhile, adds: "You are kidding me? You're serious? [The bullying allegation is] completely not true and anyone who thinks I would bully a 66-year-old woman needs their head examined."
Since then, the feud between the trio has continued, with Lady C now taking a swipe at Duncan's girlfriend Nigora Whitehorn.
Viewers will see Lady C blast Nigora for commenting that she has no class, before adding: "I hope she will soon become [Duncan's] wife so when she divorces him she'll clean him out."
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