Medidhelp unsatisfactory service

My son Ettienne Daniel Rothner, ID No: ***, took out a medical aid with Medihelp. After a year, he went to the dentist and were informed that Medihelp does not cover his dental expenses.(A filling) He phoned the help line and the person was not very helpful at all. He then decided to cancel his medical aid over the phone with the operator. The operator explained that there will be a deduction for one further month. As this happened during November 2024 he understood that a further deduction would be made in December 2024.However a further deduction was made by Medihelp in January 2025. He wrote an email to Medihelp in January and asked them to stop the ******** practice of deducting money as he has cancelled it the year before. Now in March 2025 a further R 1 638.00 has again been deducted. I also have tried to get hold of the person that sold the medical aid, but got to an office number that is never answered. We are demanding that Medihelp stop this practice and return the monies that was ********ly deducted.