what happen if buyer cancel an order when the seller is processing the order?

what happen if buyer cancel an order when the seller is processing the order?

i have made an order with this one seller. he took so long to respond. i already gave him the requirements of what i would like to order in his gig and he replied. i've been waiting for few days now. i decided to cancel the order but he said that he already working on the order and told me to see the outcomes. but the problem is, i didnt get anything at all.
can anyone please help me with this?
thank you!