Oyster Card Refund I Bought A 7 Days Bus Pass On My Oyster But Only Used For One Day. Will I Be Able To Get A Refund?

I bought a 7 days Bus Pass on my Oyster but only used for one day. Will I be able to get a refund? - oyster card refund

I am a student, and usually you buy a bus pass to travel to UNI. I bought a bus pass last week in my Oyster card, but has used it in one day, I did not feel too good for the trip. 7 days bus pass costs EUR 13.80. Can I receive a refund for the six days that I'm not using it?