It appears that your documentations were incomplete, How was your logbook, Did you mention the dates of the tasks written in your logbook?
did you attach an experience certificate from your employer with your documents?
you have to cater for sufficient evidence to validate your experience, However it doesn't make a lick of a sense to deny your logbook because you did not pass your modules 2 years ago.
Make sure your documents were complete and submit them again and try to focus on the experience part like provide a proper summary of the work that you had done during that experience period in the form 19.
And make sure you get everything stamped by the quality manager to prove it as a true copy.
I'm sure they won't turn it down if you do it the right way.