Calls made to offices in Bistol for new cleaning contracts

I am looking to expand my cleaning business' portfolio and move away from domestic cleans and towards office cleans. I am looking for someone to make some calls to offices in and around Bristol to sell our services and find out who we need to address any letters to [i.e. person responsible for arrnging cleaners]. I am relaxed about the time frame for this. Ideally to have some work comleted in the next month or so.