Unprofessional Agent, that needs to be removed from the company

Toda i have just Nimble group looking for a paid up letter as i was promised, when i called firstly the agents are hanging up all the time and transferring calls im not sure wherether its the festive season that makes them do that

Just when i was happy the an agent "Michelle" answered she asked my id number , which i had to give it to her more than 4 times,,,,so clearly i felt like a stupid because she was not listen and dont care....Just when i started screaming ...Got a shock of my life from Customer Service Consultant...She screamed so loud, yelled and just put the phone aside and explaining to collegues using "F" words...swearing at me being called "that ***** " as the client.....I nearly had a heart attack

who do i need to speak to regarding this company and its emplyees and their Work Ethic...Just when i was looking for help,,,,Got a service that left me with a shock of my life , Now ive been told that the Legal Department is closed for Festive till next week Thursday....Why our accounts are being handed over to this company that is running like a day care.....Financial Service business closed.....I want my paid up letter within 12 hours