Cancellation Cannot Be Completed

My contract with Mondo has been cancelled due to coverage problems. I have received a phone call and sms from Mondo informing me that a courier service will contact me within 72 hours regarding the collection of the router. after the first 72 hours I made contact with Mondo informing them that no courier company has made contact. Soon after I received a call from a courier company but the courier did not follow instructions and never came to pick up the router. I made contact again with Mondo, and a courier company made contact, arranged a collection bu the courier never pitched. Again I made contact with Mondo, and again the courier company made contact but no courier pitched. The last time I phoned Mondo and they informed me that the collection can take up to 3 week. This contradicts they sms I received. Up to no, I have not heard from Mondo or their courier company. I am unable to complete the cancellation while I still have the router.