Impossible to reach competent staff

After numerous calls to the call centre which is the only point of contact and not receiving the information which gets escalated.

I received a discount which is reflecting on my account. I made the first payment towards the discounted amount which is not reflecting on the system. After two weeks of calling the call centre im really frustrated and irritated with the level of service. All i hear is they cant help me or transfer me to someone who can actually assist and correct the error is a supervisor, but the supervisor is impossible to reach as they are working from home.

All i want to do is settle the correct amount and close this account. Please urgently assist and not a call centre agent who contacts me with not the necessary competencies.