******* wrong amount debited

I have experienced to many issues with hollard in the past 2 months.. first agent filled wrong information wen entering insurance info giving me a different premium in the first why wasnt the agent paying attention coz wen ths was recitified i was giving a much higher premium today that amount was suppose to be debited but to my surprise almost double was debitered.. The agents at the call centre cant seem to help me advised a manager will attend to issue what incompetance..