Its worth looking into a refund but first, you should try to reach out to the "model"/agency, and air your complaint and see if they will correct it. OF support will ask you to do that anyway, and if they dont do anything after a certain number of days, OF sometimes tries to get in contact with them. Sometimes it results in the content you asked for or some kind of resolution, sometimes it doesnt. Be aware if it was custom content, usually nothing happens because that is buyer beware. Also, be prepared for it to take a couple weeks for anything to happen. As suggested, screenshot everything in case they try to wipe out the messages, even though OF can technically go back and look through, dont always count on it. It gets tricky when they send any content even if it wasnt what was asked for because they still sent something, and it does depend on who you actually get to help. If you havent had any or many disputes, and a proven buying history, this works in your favor but its still not a guarantee of any kind.
And where did you ask for a refund? From the "model" or from OF? I dont know if models can do a refund without taking some of the same steps. Either way they make it difficult for a reason, but it is still better to try if its fairly obvious, just be patient and dont be overly rude, that is sure to get nowhere. Probably pointless to say but also dont issue a chargeback since that is a great way to get your account instantly banned for good. Not that you were considering it. Its just frustrating that scams are taking over.