Sunflex Aluminium Bifolding with faulty mechanism Beckenham BR3

The locking mechanism on this Sunflex bifold door has failed and will need replacing.  Because it has  failed in the lock position from the end door (bolts at top and bottom in full open position), it is still allowing The door to be slid open and closed even though the lead locking door is not opening outwards. This is obviously a security issue for the house owners.