Unauthorised Subscription Charges to my Vodacom Bill

My Vodacom contract is in my husbands name Mr VG Kreutzfeldt. We receive the amount on the app of my monthly charges ( May 2018) and surprise we owe in excess of R2300??? All Vodacom can say is that my limit was not effected /working and that the charges was to a subscription??? Can't say who I subscribed to!!! I have never subscribed to anything before so how can Vodacom charge me? This has never even authorised by myself or my husband!!! And as tipacle of Vodacom, we have to pay these unauthorised charges and the best that they can do is escalate our query which will take 7 to 14 days... and in the meantime if I don't pay my account my mobile services will be suspended!!! This is not acceptable at all and frankly Vodacom should foot the bill!