You will need to cancel the instruction via the platform, but this does not cancel the Direct Debit Mandate, so the payment can be re-commenced without the need for the client to agree to a new direct debit mandate. 

N.B. this will need to be done more than 6 working days in advance of the collection date, otherwise you will need to cancel the direct debit directly with the client’s bank and set up a new mandate to recommence.