DSTV - pay for Price Lock without receiving a decoder and did not consent.

We were existing DSTV clients and had to replace our decoder. We saw the Price Lock Promotion and send a sms. My husband was contacted by the Price Lock agent to inform him that he didn't qualify for the Price Lock Promotion due to the fact that he didn't want to provide his banking details telephonically. We went and bought a new decoder at Hi Fi Corp. Oct and Nov 2019 - R1 800 (double the premium) was deducted from our banking account, since then an additional R99 gets deducted for Price Lock!! Hallo ..your agent informed us that we did not qualify and we bought our own decoder!! I contacted DSTV on numerous occasions, but with no avail. Please assist (customer nr: ***3)