Every morning at 9:00, find the contracts that end in exactly 30 days.
Email each company contact to remind them of the end date, mention the office or plan they have now, and invite them to reply if they'd like to renew.
Then open a support ticket for the location, assigned to its community manager, with the company name, the contract end date, and its monthly price, so they can follow up in person.
Don't change contract dates or prices yourself.