Should you find that your mandate has been disabled by your bank (the bank, who holds the account used in connection with having HolidayRentPayment (HRP) process money on your behalf), this was most likely due to no activity within the account within the last 24 months.
If you have cancelled your direct debit with HolidayRentPayment (HRP) or have change banks without informing HRP, they will no longer have access to your account, resulting in no activity regarding HRP any longer.