Groupon are shonky

I purchased a voucher for a massage using my PayPal account. Unfortunately before I could use it the coronavirus hit, and I received a notification that they would no longer be able to offer the service. I contacted Groupon to get a refund and even though I paid with my cash, they were only willing to reimburse me as a Groupon credit. As I don't shop on Groupon very often this wasn't acceptable, I used the money out of my bank account and want the money to go back there. They are utter crooks.