Possible **** from attendant

i have reason to believe i was ****med at shell turfontein yesterday (2025-09-01) where i poured about R100 worth of gas and my car is a 40 ltr vehicle and with R100 gives me 4.72 litres and being that my car is a 1ltr engine always gives me about 17 km before reserve but yesterday my tank decreased instead, even today it's still on a decline, i've written an email to *** but i havent been responded to -please note this review stands to be corrected