Bad service

I'm very disappointed by the client experience that I have received from the Engen garage at Pietermaritzburg Long Market Street. On the 18/02/2022 I went to fill petrol and after the Attendant was done assisting me I noticed my car petrol gauge didn't move. I asked him about that because I have never experienced such before. He advised me that sometimes that does happen and after driving off for minutes the gauge will pick up. I did drive off for about 5minutes but still the gauge didn't move. I had to park the car for about 10 minutes thinking that maybe it will will pick up after but it didn't. I drove back to the garage, the attendant told mybe there was a problem with my petrol gauge and He advised me to fill at least R50 to see if going to move after. I filled R50 from a different bouzer and the kilometers moved indicating that I have filled R50 which proved my gauge didn't have an issue. When I asked to speak to the manager or the person in charge there was no one available. Attendant gave me his bosses number name Moh, I had to phone him using my airtime and explained my problem. He told me he can't help as it's was already after 5, he will only be back at work on Monday. He then asked me to send him a whatsapp message explaining what happened and he will investigate the matter and come back to me on Tuesday the 22/02/2022. I sent him the whatsapp with all the details and what he did was to bluetick me. As I write this review on the 02/03/2022 He has not contacted with feedback.