Bad service for product upgrade

I have been trying to cancel my LTE product for the past 2 weeks. No help over the phone whatsoever. No answer by the Billing department or the Sales agents. I only had a call answered by the Technical department and then they also put me through to the Sales agents. Again, no answer. I wanted t upgrade my LTE product to Fibre but now I am considering leaving your services for good. I have never had any issues with MWEB but now this is too much. I need someone to contact me ASAP.