Cancelled services before any data usage but being billed 8 months later

Home Cloud is pathetic. I cancelled my services with them in September 2019. But was still being billed by them in October 2019. I was offered a discount on my old package im November 2019 and was told they would reactivate the old sim card linked to my account. I agreed to the reactivation and the new monthly premium. I was contacted telephonically and the sim card was apparently reactivated. It was not reactivated and I contacted them numerous times over 7 days to get them to reactivate the sim card. I was told I needed to pay a top-up amount that came to more than my monthly premium just to reactivate the s card and it was by now the last week of November. I decided that it was not worth the trouble and decided to cancel the contract. They continued to bill me and I stopped their debit order on my bank account. I had contacted them numerous times via phone, email and their watsapp platform to notify them to cancel my contract and zero all amounts owing by me as I had thrown away their sim card after cancelling the contract and was not using their services. Eight months later and I am still receiving emails and sms'es to remind me to pay my Home Cloud account. I am sick and tired of explaining the situation to Home Cloud accounts department. They seem to not understand that someone cannot pay for services not rendered....really annoying and clueless company.