Not able to contact anyone about our account

Our Trudon account has moved from Telkom directly to Trudon Yellow Pages. We have attempted to e-mail the sender as well as call their offices and our Advertising Consultant without success. Our last contract expired in February 2020 and no-one has contacted us to discuss any changes or cancellations yet they have sent us a huge bill. We have dealt with Lebohang Modikoa, Roderick Smale and have attempted to contact our Sales Consultant, Angelique Becker, both telephonically and via e-mail with no response other than an e-mail from Roderick advising that somebody would contact us shortly. As there has been no new contract signed, it would be ******** for Trudon to debit any of our accounts and we would like to make that very clear.