Helping another customer over me

i shopped at PnP lotus river and your cashier Doane need some customer training.After he helped me and I was not done yet he assisted another customer right over me.I had to ask him why he did that He just said he thought that I was done and before he helped the other customer I still spoke to him.In fact when I came to his till he already had an attitude.I'm regular shopper at Lotusriver and it's the first time I get such poor service.