Lost Airtime mysteriously

I lost above R60.00 airtime from the subscription that I've never made. I called Vodacom Call-Center on 05 March 2020, after I stopped the subscription through self-service. They couldn't tell how I subscribed, but confirmed that my airtime was taken with R7.00 every hour by a service called ExploreApp.

I requested that they should reverse it, and I was told that they can't but can stop it. So, now my R60.00 airtime is gone and I cannot get it back.