Does the cute server want me to go back? Or was the billing a mistake...?

So I went to eat lunch by myself and this was my first time at this ramen shop. Therefore I was not familiar with the cost of items. So, I entered the place and was seated by a very cute waiter. He immediately asked what I wanted to drink. I told him sprite, and he came back with a cup full of ice and a can of sprite. He then asked me what I wanted to order, and I quickly chose miso ramen. Now, the ramen was priced at 11$ and the soda was $2.50 per can. I did not know the soda cost that much but anyways... I began to eat my bowl of ramen and half way done the waiter comes back and asks if everything was fine. I said yes, and pressumed to eat. (Keep in mind my glass was half full at the moment). He then comes back and leaves me another can of sprite! I know I was not gonna pay another $2.50 for a can of sprite. I was then finishing up and he comes again and leaves the bill next to me. So, mathematically, I should be charged $11 for the ramen, and 2.50 X2 for the soda. (btw, I never opened the second one since I was so full). So, the total should be around $17.32 with taxes but the bill only showed a charge of $11.95!!!!!!! He only charged me for the bowl of ramen?????