What to do if it has been 6+ months after the wedding and cannot get in touch with the photographers?

I could really use some advice and support. My husband and I got married on October 8th 2017 out in California. We received wedding photo previews about 3 days after our wedding (approximately 4-5 photos). Our original contract is to receive a certain number of sized prints in addition to a personalized wood photo USB (came with an additional charge). The USB was supposed to be given to us 6 weeks after the wedding date. We received an USB (just a regular computer USB) in December that year so we can go through the photos and get the prints. We finally received our prints in March of 2018 and are still waiting on the personalized USB. Now, we cannot get in touch with either photographer and we are supposed to be moving overseas soon. We have called and texted the photographer who did our wedding and have tried to be polite and as pleasant as we can be. To no prevail. I even resorted to going on their Facebook page, where I can see they have been taking care of photos from other weddings now (June is a busy wedding month as I have been told), and have been trying to message them and have not heard back. How long should I wait before I keep contacting them? I used to wait the month in between, then weeks, now it is looking like no more than 3 days before I am sending out yet another message. Am I being ridiculous? Did they find a loophole in the contract that, since I took a USB (not the exact one we were supposed to get as per agreement from our contract) and received my prints, they are now not liable to give me the product I originally paid for? Should I have tried email instead? I would really appreciate the help and advice. Thank you!