Engen 1-Stop Highveld

Engen One Stop Highfield from Pretoria on R21 to Joburg side

So my dad put in petrol they card machine didn't work I made a e f t to them I send to my father the proof of payment and to them they do not want to accept the proof of payment and said they will wait until it on Their system it's upside to Absa so it should show buy them straight away so my father gave his phone to them when to Kempton Park draw money paid them and took his phone and they don't wanna give back the money that was ft to them so what do you think I think I can do about it Engen One Stop from Pretoria site to Joburg side on R21