MEDI ASSIST IS A ****

What a terrible experience I'm having right now with MEDI ASSIST,these people have been debiting money from my account for some time now,I tried to phone them to stop this/cancel it but they were very rude to me,I went to my bank and they told me that they do not have the authority to stop it because they are a third party,I'm struggling to stop it and I do not want to change my bank coz of these *****s,please guys DO NOT LET THESE *******S CON YOU LIKE THEY DID TO ME,WARN THE OTHERS ABOUT MEDI-ASSIST