OLD MUTUAL INEFFICIENT AND REFUSING TO CARRY OUT MY QUERY DATED 24 AUGUST 2020

I have requested for Old Mutual to cancel my savings plan but they refuse to do so as i have been sending e-mail after e-mail but i am not receiving any feedback. My request for the cancellation of the savings plan is dated 24 August 2020. I e-mailed them a reminder again on 01 September 2020 still no response. They then only gave me a vague response on 16 September 2020. I tried to call and call them without any avail until i decided to complete the form they sent without proper instructions. I sent them the completed after many attempts to call them failed. I sent back the signed form on 29 October 2020, i sent another enquiry on 12 November 2020 and still nothing. I am not sure if Old Mutual is refusing what i know is within my rights of cancelling the savings plan due to to my reasons. Kindly assist me in this regard. I also tried calling them again and have been on hold for a long time. Please assist me.