There is no obvious compensation event for this and it is not envisaged that the PM has the authority to do this.
However, given that you say this was an "instruction" from the Project Manager, a good argument could be constructed that the Project Manager was adding a constraint into the Works Information - i.e. you are not allowed to use this Subcontractor any more - and this is therefore a change to the Work Information and a compensation event under clause 60.1 (1). Overcome this hurdle and then we can have a discussion about compensation !
However, given that you say this was an "instruction" from the Project Manager, a good argument could be constructed that the Project Manager was adding a constraint into the Works Information - i.e. you are not allowed to use this Subcontractor any more - and this is therefore a change to the Work Information and a compensation event under clause 60.1 (1). Overcome this hurdle and then we can have a discussion about compensation !