Poor and Pathetic after-sales service ever!

I regret doing an upgrade with Netstar. I'm now being debited for a package I didn't choose, I've tried calling many times for the past 3 months, spoken to several consultants to rectify the issue but instead I'm being taken from pillar to post with no clear explanation of why I'm being debited wrongly. I'm disgusted by this pathetic service and ready to cancel this contract. Netstar has no regard for its customers, so much incompetence!