finrite does n`t want to refund me

I cancelled my insurance on the 12.11.2018. the agent that assisted me Said I will have to pay for one more month. My premium went off on the 20.11.2018. my policy was supposed to be cancelled and removed from My name by the 12.12.2018. as this is 30 days. However finrite still debit Me on the 20th Dec. and the 20 Jan 2019. I called in several times to do Follow up`s to confirm if the insurance was cancelled and will they refund Me. I spoke to different people at Finrite, Karabo-10.01.2019; Katlego 14.01.18 Lina 12.11.2018 all of them saying they have escalated the case. However, I spoke to Lujanda 21.01.19. and he said I was suppose to give 30 days’ notice and my last payment was supposed to be in Dec. Which I don’t understand how is it possible as I already paid in Nov. Why should I pay twice just coz my debit order goes off on the 20th Of every month. I`m very upset that finrite is giving me the run around And that they are coming with all kinds of excuses not to pay me my money. PLEASE GIVE ME MY REFUND.