Bad service

I cannot get my problem solved after a various emails and phone calls I since the 5tth October until today there is so many people to contact, I am still waiting for my medicine and for them to reconcile my account the amount on my original invoice and their current claim is not the same I am eagerly waiting for their response there is a call center that give me an option to ask them to phone me back with a brief explanation of my problem needless to say I left several messages and did not receive even one call and also stop blaming things on covid. It is very difficult situation