Disappointed

So a few months ago I wrote a positive review about Engen Sarnia, but today it saddens me that I have to write a negative review. I am a regular customer there and have been very happy in the past, but the past few times I have been disappointed. I spoke to the one manager and his attitude wasn't very good but things seemed to have changed a bit when I went this morning and then when I checked what I was charged when I got to work, I saw that I'd been over charged. The managers attitude was terrible when I phoned and told me I can come and fetch my R5, it wasn't just R5. The point isn't whether I was over charged with a small amount or a large amount. The fact of the matter is that I was over charged. The manager on duty was actually very rude. I had the owners number but lost it when my phone crashed, so I asked for his number and they refused to give it to me, I asked when he'd be in and they refused to tell me. The person who answered the phone answered so fast and could hardly speak English and was clueless to what I was asking. I'm so disappointed as I'm a loyal customer and now a few people in the company are making it a nightmare for others. Most of the attendants are so friendly and know what they are doing, but others are not good at all. I would love it to go back to before these managers were there. Please front of office is so important and so many people get it wrong.