A company that needs investigating themselves!

Honestly the most pathetic company around. Randomly out the blue I get an email from them telling me I owe Multichoice R165.87. First of all I have been living in the UK for 2 1/2 years and closed my account before leaving. When back on holiday in December 2020 I bought a new decoder with a holiday package. Surely if I owed Multichoice money they would have raised the concern when I bought new decoder? Added to this I have tried to phone the head office number on their website which doesn't exist and when phoning the Durban office it just rings. They offer a WhatsApp service too but I have been waiting for a week now for an agent to get back to me - apparently "connecting to agent" according to their WhatsApp message. Very threatening emails but then no way to contact them! Can also only put a 10 digit phone number but no space to put a UK code