What happens when the Project Manager doesn't reply properly either to a notification or a quotation?

What happens when the Project Manager doesn't reply properly either to a notification or a quotation?

Date: 19 Apr 2017

There are a number of stages that a compensation event needs to pass through before it becomes implemented under the contract. Is it possible for the PM to de-rail the process by refusing to engage in it? If there is a lack of engagement what happens ideally and practically?