GEMS are unprofessional

Towards the end of March 2017 I have decided to change my GEMS option from Beryl to the new Emerald Value option. The Application form was sent to me to complete. The application form provide space for changing of nominated GP, with no space for practice number. I also decided to change my nomited GPs . Accordingly, my option was changed from Beryl to Emerald Value. The person who was capturing details forgot to update my nominated GP's as requested. However, I received a confirmation email from GEMS that my options were changed as requested. I was surprised to receive email form GEMS that they will not pay 100% of my consultation fees as I used GP that was not nominated. So I will have to co-pay on the account . I sent numerous emails to GEMS to update my nominate GP's but they failed me still. I even tried to call them and they were so rude to me. I have contacted one of their consultant at workplace but I failed to get help. They were still continuing to charge me for co-payment. Recently, on the 18 September 2017 I just received email that they have fixed problem just to realized that they were lying and they still allocated wrong GP to my son. So now I owe R 800 to my GP because they failed to update my nominated GP's in time. The question is who is supposed to pay my GP. I am really disappointed.