I didn't know i had 45 days to open a case and my item still hasn't arrived. What do i do?

[megc12311]

I bought an item of a seller and i it had been over a month since the purchase. I've bought other items on ebay and have had them arrive already. I tried contacting the seller a few times but i've had no response. It was only a small cost which doesn't fase me but i would like an answer. They have 99.8% as well.