Disappointing service from Netstar

Very disappointed with their unresponsiveness. Have tried to cancel an add-on feature (offered via telesales in December 2024, and accepted provided that they email the details to me first, which never happened) since January 2025 but without success. Contacting the call centre is useless - unless you're prepared to wait for ages for someone to pick up. WhatsApp didn't help either - the call within 2 days promised by the automated response never materialised. Strongly considering cancelling my Netstar subscription altogether - after way over a decade. Current service levels are simply unacceptable.