Admed Guardrisk bad service

Since July this year I have been ill and in and out of hospital. I have submitted various claims to Admed in this time. Their service really has not been good. I have to submit claims over and over as they just do not attend to them. If I send them a mail asking a question, there is no response. They do not pay amounts claimed for. They send messages asking for documention which had been attached in the first place. I get the idea that they are stalling in order for the 4 month submission time can lapse so that they no longer have to pay us. Their submission process is also long and arduous and not user friendly.