Discovery does not care

Worse service ever received Went last in July 2020 to dentist that I always go. Me and my wife went on the same day. In February 2021 the I received a letter with lawyer cost for collection. I phoned Discovery a couple of times and then they never come back. Now they said the dentist was suppose to put it through again, but now it is to late. From R540 now I must pay almost R5000. It is like they do not care at all. Been with them form 2011 me, my wife and both my kids. But I think for all the years my contribution was not enought