Wedding Photographer Unresponsive

My fiance and I paid a nonrefundable retainer and signed a contract with our photographer last year. Our wedding date had to be moved due to COVID. I spoke with him via text in March and he stated that he believed our new date was available and that he would confirm with this partner. I have been asking since then and no response. My fiance messaged him in July and received a response similar to the one I received stating the date was available and he'd confirm and get our modified contract to us. My fiance followed up with calls to receive nothing back. I sent a text at the beginning of August with an email that following week. When I access our account through his site, our old wedding date of 9/11/2021 is listed. He's on Facebook all the time soliciting and responding to inquires, but his excuse to us in the past has been he's busy. We are ready to shop for other photographers, but we also feel we are due the retainer back as he's been unresponsive. I'm a stressed bride!
.