Yes. I also topup on my own and I use the distilled water from the Shell. I also give instructions (not strictly but friendly) to the SA on what needs to be done and what not. For this reason, they always call me back before doing anything. But, I don't bother to question minor items on the bill. I believe in moving with those guys in a friendly manner to get my things done instead of questioning them for each and everything. For this reason, I am always attended to promptly even if I don't have prior appointment sometimes.