Located at Caltex Guar, Kedah. The cashier was so rude when he insulted me, which he did not notice that I was still there. This is my first time paying for fuel, and worst and bad service experience ever. He just took my money, and never say anything, then after seeing i still standing there, he asked me do u need receipt? I just answer him, what do u mean? then, he did not reply me, and I asked him, so can it be used now? because I don't hear you say, done or anything which can direct me to the next step. He just said Yeah in a very annoying voice. After that, I went into the shop for drinking water and clearly heard that the boy complaint to the other staff about me asking such thing and insulted me by imitating the way i asked. Such a bad customer service. Complaining here, just in case u need some improvement, maybe can improve customer service experience.