Refund declined - Medical aid ***

Discovery Health refusing to refund me for the money i personally paid to the PAEDIATRICIAN for my new born. I have submitted everything they wanted from me only to come back and claim that i didn't follow the correct process even though i have made my financial adviser aware of the delivery of my son. I have since cancelled my membership with them and now they have come back and told me that i owe them R2 048.16 and they are even threatening to blacklist me for this amount even though they refused to refund me R3351.50 that i paid to the PAEDIATRICIAN.