Unsatisfactory oil service

I took my car in for service on 12 December 2025, before travelling to the Eastern Cape for the December holidays. Upon return, I had to refill oil. This is not happening for the first time, it has been the case since I started servicing with them in 2022. I made the service advisor aware of this, and before servicing with them, I used VW Menlyn in Pretoria and never had any problems with oil until the next service or I would only fill oil a week before the service, and I would travel to the EC even then. My car does not leak whatsoever, I do not think it is normal to refill oil after not even a month after servicing.