Fill up with Air

I first had a bad experience with Engen Siyaya in White river, then Engen Parkville White River and recent one is Engen Rocky Creek,where on Monday 4th October afternoon I went to fill up my Petrol in the afternoon. First the pump was very slowly as it took more than 15min to fill up less than 25 liter petrol. When attendant was done my guage on moved with 1 bar as I had 1 bar leaving me with 3 bars not going up. As they always say it's the sensor. I requested for a slip and wen back yesterday afternoon as all bars wasn't showing. I was told to contact dealership yet my car was gone for major service 2 weeks ago. This morning as I was driving to work that one bar came down. Now I am back to the same Petrol I had before filling up Monday afternoon. I always choose Engen cause I bank with FNB and because I use Clicks card but they are a ****. There will be a time where certain pumps just fill you with air. I am very disappointed but this problem I always experienced around white River and some owners or managers are having attitudes and will never admit. With Siyaya I put Petrol going to Ermelo before reaching Carolina I had to fill up as in all traveling I will come back with the same Petrol. And all this things you experience when you are low on cash it's very painful what they are doing to us as consumers.