to the forums!
There is no refunds from the PSN.
Also note this is a public forum....
Here is a similar thread you might find interesting.
Dear PSN do you allow Refunds on add on content my account is vampireboy16 and i would like a refund on the Defiance season pass please reply.
Welcome to the PlayStation Community.
No, generally all sales from the PS Store are final & no refunds are given, having said that it is your perogative if you want to contact customer support to see what they say.