ZERO confidence in the developers technical support at Sage

So I have been a SAGE one accounting Advisor for the best part of 15 years. In Dec one of my clients started having a transaction duplicating error - which is normally fine because the system is designed to pick up duplicates which are then easy to check and remove. In this instance the system was creating thousands of duplicates and not detecting them. This problem has been ongoing for 4 months now and Sage are still no closer to even identifying the cause of the problem let alone resolving it. I have ZERO confidence in their developers and sometimes even wonder if they have any? Or are they just riding on an existing system with NO technical skills in the back office? Week after week after week I follow up only be told... no further insights into the problem.