As you have been advised.... ask for their cooperation to track down the examiner . Presumably it was the school you paid for those exams. tell them that if they are unwilling to assist you by recovering the "missing" passes, you will have to take Court action.
Prepare a Plaint for the cost of any necessary resits, telephone calls , letters, visits you make trying to sort out this matter....then be prepared to pursue them through the small claims procedure ,which I believe you can now do on line.
It is likely that the thought of time and expense of attending a court hearing and the damage to their reputation,is greater than the cost of putting right their bad record-keeping.
You have not helped yourself by allowing this to drift for so long.
to be a good pilot you need to be disciplined and methodical and pay attention to detail.
