insurance company whinge

we have had the jackaroo insured with budget insurance because there premiums were cheaper than most and had great 4wd policy.
our renewal was meant to be with drawn from the bank but a mistake in the bank acount details meant they couldnt take it out.
premium was $260 something.
got a letter saying there was something wrong with the bank acount details we will now have to pay by credit card.
we dont have a card so we organised it with a friend we put the money is his account and phoned to pay.
they say oh sorry the amount is now $307 something.
wtf how can it go up nearloy $60 in a week.
oh the other price was given to you before all our premiums went up new premium will be $307.
well we wont do anything for now ill price around and get back to you.
decided there probly the best deal so we will still use them.
ring up today after we put more money in our friends bank account to do the deal.
oh sorry sir you prpemium is $347 not $307.
wtf how can that happen in less than a week.
we have changed underwriters so they have gone up since you last spoke to us.
ok forget it ill ring allianz back and use them as they were only $1 more than you at $308.
well thats my whinge for today.
and aslo does any one know if allianze are any good please.
cheers