put in R70 petrol and no change an anything at all instead kilometer left to travell before i run out are going down

went to put in petrol for R70.00 to my surprise there was not change on the number of kilometres left to travel before I run out on my i120 ,asked what happened from the guy that was assisting me and he said he did put in petrol and has a slip to show, he looked on all the slips he had could not find mine .

he went to the cashiers the only slip for R70 they could find was for way earlier and for a 93 and I mine was supposed to be a 95 adv. the guy it’s not mine and he went back to the cashiers and they adv. that's the only one for R70 asked for the Manager he came to my surprise with the slip for 7h15 for R70 for R95 and R140 which they said was combined with someone else ,

I asked the manager to check and tell me what is going on here and he said they will look at the footage only in the morning to see what happened I went there in the morning met another manager that said all he knows is the petrol was put in and there is nothing he can do for me and he continued to say if you put in R70 on his i10 there will be no change in the kilometres left for him to travel before he runs out and definitely will be no changed and in the number of bars you have left.

I know this is my first time put in less than R100 but how can almost 4 litters make no change at all and was advised by Both managers it’s not the first time they get such complaints and they tell people it will show after sometime if it does not people must come back and they do not so to them that is confirmation that it did show but same time he says on his i10 R70 worth of petrol will not make any difference so I'm confused and very angry