Bonitas bad service

At the end of December 2022 - I wrote to Bonitas to cancel the Medical Aid because we could not afford it any more - did not get a response - and every month they try to take money of the account - and almost every week or so I write another email asking them to please cancel and stop this - but get no reply - I have finally got through to them - and now we must fill in a form and give a months notice ??? Really - are they serious !!!!!