Double installment taken off without permission

Hollard only allows debits on 25th and 1st. I get paid on 28th. I changed my debit order date to accommodate Hollard for the 1st. They took a double installment for Both March and April on the first of April. I was not notified this would be done. AFTER two days of back and forth via email, I was told a manager will call me and I must go through to complaints. No manager called. I am done with Hollard. I emailed them I want my policy canceled with immediate effect and my April installment paid back to me. VERY VERY bad service. I took the policy with Ooba and they have done nothing to help me. I am done and canceling both policies I have with them