Not respecting clients

This people are very quick to threaten you with blacklisting when you owe them but after you made payments and want to follow up on payments which some they claim to have not received they start not answering their so called helpline....i recently sent them prove of my October payment which they claim they have not seen since then they are not answering my call apparently they no longer on the line.such behavior is dissapointing from a whole national broadcaster who keeps making noise on radio and tv platforms about payment of tv license!!!