If you have not yet done so, open accounts at ov-chipkaart.nl and at ns.nl, and connect your ov-chipkaart to them.
Look at uitcheckgemist.nl and in your account at ns.nl for possibilities to repair by yourself the missing checkins and checkouts.
If, after checking all your travel and invoice data, you suspect unauthorized use of your ov-chipkaart, then block it at ov-chipkaart.nl.
Concluding, as a fellow NS customer, I cannot inspect your card and account data. For this you need NS customer service.
Look at uitcheckgemist.nl and in your account at ns.nl for possibilities to repair by yourself the missing checkins and checkouts.
At ns.nl you should also find an invoice detailing what costs you were charged for and when.
Please reimburse me €60 paid for the period September-November for the incomplete trips on the following dates: August 1, 2024 at 16:09, August 2, 2024 at 21:22, and October 3, 2024 at 09:41, as these trips were completed in Breda and Rotterdam routes.
How can you have so many incomplete trips which (as you claim) terminated at Breda or Rotterdam?
Both stations have gates so how did you leave these stations without going through the gates?