Medshield Bad Medical aid

Good day. This is probably one of the worse medical aids i have ever came accross. Last week after 3 weeks my pre auth was approved i hqve ask them to change the date still no feedback now i am sitting wit a bill over 2000 which they only paid 477.What is the use of having a medical aid... I have asked to change my debit order up untill today no feedback at all. I would not advise anyone to join medshield. Service are bad...