Why Pay to use the Bathroom After Paying For a servics

I went to th Caltex Garage situated in Pmb in Commercial Rd on the 4th March @ 3:57 in the morning. I filled up Petrol for R719,20. Aince I have been on the road most of the night. I asked the security guard to use the bathroom. He told me I had to pay R2 to use it. Personally I feel its not fair, after paying such an amount for petrol.I coukd have chosen another Petrol Filling Station, since there are other outlets on the same steet. In fact in the future I must just as well used Shell, which is nearby as with them I wont have to pay the additional R2 after paying for petrol. I feel you need to review this especialy if the motorist has used and paid for any other service that is provided by your outle.