Complaint about Telkom data allocation

Morning

I have a problem with Telkom, since December 2021 they have been diminishing my data, on December 2020 i only used 6 and lost 4 data, January 2021 it was better and now in February 2021 i have lost 6 data and used only 4 data when i approach their different branches they all tell me that i have used all my data which i am monitoring them according to the router. Kindly advise on this matter. I am really tired of travelling from one branch to the next.