50% premium increase since signing up

Second year in a row where my premium is increasing with more than 20% despite my vehicle depreciating in value. To add salt to this wound they notify you of it and then give you 48 hours to decide whether you would like to accept the new debit order mandate. No claims on this policy ever, yet this is how they treat you. Just steer clear of this company. Just because you can doesn't mean you should....