Terrible customer service

I have rented my fridge with Teljoy since 2018. (a 36 month contract) I have been trying to get hold of customer service for a week now to find out how long they still want me to pay! They are very quick to send a monthly invoice to pay but when you ask when, according to them, your contract is suppose to end, you receive no feedback! I have also not received any communication from Teljoy to say that my contract with them have ended / will end soon???