Shocking service after 10 years of being with them

We have been with Momentum Health for 10 years. I recently had a baby (born in beginning of December) and had to leave Momentum in January of this year as we were going onto a company medical aid. I subsequently resigned from my job and a month after migrating medical aids asked if we could go back to momentum as I was leaving my company employ... After much back and forth I eventually received a bill for almost R10 000 - I then phoned momentum and they said we had to back pay our premiums (February's as well because the matter has not been finalised as we have been waiting for responses form them for so long) and only then would they reinstate the policy. Otherwise we could do a new policy BUT THEY WOULD DEFINITELY IMPOSE A 3 MONTH WAITING PERIOD.. This is crazy. Nothing in our health status etc has changed and they were our medical aid when I was in hospital (which is the only time any of us have bene in hospital) .. Funny.. CAMAF allowed us onto their medical aid without a waiting period. Guess Momentum is not the best anyway..I was also promised feedback from Momentum yesterday but I have heard nothing and have now phoned 3 times.. terrible service and peoples lives