Billing for claims approved!!!!

This is getting ridiculous, I have tried to sort this out, but Oneplan looks like they are only interested in taking your money and not correcting their errors!! They have been sms'ing and emailing me for outstanding claim which I have sent them the proof of payments for, for 2 months now, and after speaking to I don't know how many people, the consultant told me that my claims were approved and that it is a Technical error on their side and that I should not repay any money, I get yet again emails and messages today, telling me that I owe now about half of the original amount that they first started claiming!! I am starting to get really frustrated with people being to *********** to do their work. Hardly ever use my medical insurance, and since I've started using it, it is endless trouble. Always some problem, not adding members on time or communicating with you as client, not doing what you request, claiming money from you, when you have claimed from them. I've referred so many people to this medical insurance, and starting to feel embarrassed as they are an *********** medical insurance in dealing with queries and their clients!!