Business plans are not "supposed" to be higher than personal accounts, however if your usage is higher than a personal account, you must set your allowances accordingly or else have overages which will increase your bill.
How many phones are on your plan? How much data are you consuming? What plan do you currently have? If not on a Share Everything plan, what is your minute allowance and how many minutes do you use? You have not provided information which would make it possible for anyone to help you.
You say "a thousand dollars". Is that monthly? Is that over several months? Again, more information would be required before someone would be able to give any useful advice.