If you want a refund on the PlayStation Now subscription, get in touch with PlayStation Support through the phone or live chat, both of which can be found in my forum signature. If you're looking for the link to the live chat feature, click the orange icon.
Playstation Telephone Hours: Monday-Friday 8:00am-8:00pm PST (Closed on Saturdays & Sundays)
Customer Service - 1-800-345-7669
Account and Billing Support - 1-877-971-7669
Sony Rewards - 1-888-715-7669