Poor customer service

I went to Mabopane engen garage on my way to my grandmas’s place, and when I got there the petrol attendant comes to me and says that he’s been waiting for me as the last time I was there I left without paying for the fuel which was R250. I told him that there’s is no way I can leave without paying for the petrol and he insisted that I did so I told him that I’m not in a rush and I can park my car and we check the cctv to confirm if indeed I left without paying and he said “ke mmotsa masepa” there’s no way that he can lie to me about something like this.