Frustrated Client

I purchased a ticket and did an online check-in day before my trip . After that I missed my flight on the day of the trip and therefore I didn’t travel , I’ve been trying to call you guys but no luck . I’ve been send emails and I am getting slow responses. I have given everything needed and No seems to care or assist me . This is frustrating, I know there’s no refund but I need the money that I spent on the plane ticket to be reinstated in a form of a voucher so I can use it in future should I travel . I cannot afford to let this go as I spent a fortune on this ticket . My contact details are *** and my ticket reference is 3856D56C. I need this matter sorted as I didn’t know that me checking in day before would ruin everything