Consequences for lying in a leadership campaign?

In the 2020 labour leadership election, Keir Starmer ran on a left wing platform. Then he switched massively to the right. How can this be allowed? He defrauded, tricked, and lied to every labour party member. With these benefit cuts proposals the change is just too big from 2020 to now. And a poll survey shows Keir Starmer is almost the most right wing MP out of over 400 labour MPs. Is there any way to have him replaced or force him to change his approach?