Homeowners cancellation issues.

On the 26/05/2024 I got an email from Nedbank home cover insurance with a renewed insurance policy. I decided to call Nedbank to make a new personalised home owner insurance which won't be link to my home loan premium, will debit directly from my bank account, I also included home content cover with the home owner insurance. On the same day I cancelled the old home owner insurance that was linked to my bond instalment because i discovered it was very expensive. After we did a quote of the new policy I was told the new personalised insurance will debit a premium of R646 on the 15/05/2024, my concern was I do not want to be debited twice by the new and old insurance. The lady at cancellation said to insure that I don't get debited twice she will transfer me to a department where I they can delink the home cover insurance from the bond instalment. She told me the insurance will be canceled on the 14/05/2024. A guy from Nedbank home loan told me it was suppose to delink automatically after cancelation I must call them after 48 hour they will talk to their IT department to see if they can do something to delink. I call on again on the 03/05/2024, of which my problem was still not sorted and I was advised to write an email which I did and got a reply on the 06/05/2024, stating that the home owner insurance will cancelled on the 14/05/2024 and I'll receive a cancellation letter on the day. On the day. On the 14/05/2024 I did not receive any cancellation letter I decided to call Nedbank, the lady I spoke to told that it was only set to cancel on the 18/05/2024, I ask her how because I have new policy that is meant to start on the 15/05/2024 and I can not afford to pay for the same product twice. She said she will help me cancel the old home owner insurance which she did I got sms after stating that policy has been cancelled. I asked her to check if it will automatically delinked the the premium from the bond instalment she transferred me to bond department. I spoke a lady who told me that they only delink it from 15/06/2024 meaning for 15/05/2024 I payed ruffly around R1021 for home owner insurance cover. What makes me Angry is why am I made to pay for a cancelled insurance, and if they knew that they can only delink it in June, why didn't they make the start date of the new policy in June to avoided double payment on my side. I feel cheated by Nedbank and I feel what they did to me is *****ulent because I commutated everything and I have email as proof of them committing themselves to cancelling the the insurance on the 14/05/2024.The lady at cancellation also told that they won't be refunded on my side but they still went ahead and debit premium for a cancelled policy.