Deduction of funds no handset

I was offered an additional contract by Mondo on the 05 December 2022 by Moda/ MTN to date no sim or handset has ever been delivered to me even though they have been deducting funds from my account since December 2022. The monthly amount is R317.98 and there is no handset ever delivered. I have written to both MTN and Mondo to cancel this transaction as they have not delivered from their side, however they have ignored my plea. This is the first account and a secondary one dates back to 23. March 2023 with a monthly deduction of R317.98 where there is monthly deduction of the amount to date. Mondo or MTN have been taking my money even though no goods were delivered. Both contracts are for a period of 2 years. I have since approached MTN about this matter and there is no response. I am really upset that they continue to take my money without meeting the promised delivery of a handset.