Debit orders still going off months after cancelling

So I was called by the complaints department that told me my policy was only cancelled end June 2018 after I explained above that I cancelled already in May 2018 and when I phoned end of June the lady told me my account was not yet cancelled. I received an email 3 days ago sending me a copy of my cancellation letter but I am still being sent emails and sms saying my account is in arrears !! It is not in arrears I cancelled for end May 2018 affinity failed to log this , this is not my problem. I have never used this policy for anything so there should be no reason to keep harassing me !! STOP THE EMAILS AND SMS'S I DONT OWE AFFINITY ANYTHING ! YOU HAVE BEEN RECEIVING MY PREMIUMS FOR MONTHS AND KEEPING THAT ALREADY SO LEAVE ME ALONE!

So after the last response above. I was contacted again the person apologized and assured everything was in order and I would no longer be receiving calls from affinity. Yesterday Affinity kept trying to phone me. I eventually answered and spoke to someone identifying himself calling from Affinity rescue. I stopped him and told him I have been in contact with the complaints department who assured me I wont be contacted again and that I would appreciate if he not call me again. He kept talking telling me that being without insurance is not a good option I then told him I dont need medical aid I dont use it and have a hospital plan for incase I am hospitilized he kept going on and on. I told him over 6 times I am not interested I cancelled for a reason and to stop bothering me he still kept on talking !! Eventually I told him again that I said I am not interested and Put the phone down. He tried calling again straight after that . Then I received a message saying my policy is in arrears !!! This morning again Affinity health has been trying to call me from early on !!! WHAT DO I HAVE TO DO TO BE LEFT ALONE !! I CANCELLED FOR A REASON AND I WOULD NEVER EVER DEAL WITH THIS COMPANY AGAIN !!