Does not adhere to the terms of the policy

After simply ignoring the payment terms in my policy and collecting the premium on a different day without notice I have now been struggling for more than a week to get it corrected. They simply ignore my instructions and submit debit order mandates despite me clearly stating that the previous mandates need to be removed first. They also submit mandates which allow them to move the payment date. When I asked them not to do that, they simply ignored me and submitted another one. Right now they already have 2 mandates active against my account and is requesting a 3rd one meaning that would be able to take 3 times my premium from my account, and because its a DebiCheck mandate I will not be able to dispute this. It is extremely frustrating that Auto & General refuses to adhere to the terms of our agreement, and will not refer me to the complaints department to get this issue resolved