Is it possible to complain about a seller?

[rubberstud]

I purchased a leather coat and two days later received an email from paypal saying the order had been cancelled and the seller claimed that I requested the order be cancelled.

I went back to sellers page and looked, the size I ordered was no longer available.  So, I ordered the next smaller size.  Next day another email from paypal saying the seller cancelled and claimed that I had requested the cancellation.

I did not request either cancellation.  I went and looked at sellers page again and the price on these items has since been raised from $139.00 to $499.00 which is more than triple.

Is there anyplace where I can file a complaint about this?  If the seller wanted to raise the price, why cancel my order and two days later the old price is still listed?

I wanted to file a complaint against the seller but ebay only provides ways for me to cancel the order or report that the order never arrived.  Is there any way to file a complaint?  I