Poor communication

I have joined Bonitas Medical aid with the plan of BonCap. I have phoned in and signed up with the lady at the call center. I am aware that the option that i have choose was based on the salary but no one have told me that we should send in every year the latest payslip and bank statement to update my profile. They deducted double of the amount that i was supposed to pay. When i phoned they said that they have send in emails for the application, yes it was my fault for not reading my emails but i have a job as a technician so i do not have time to read my emails. The least they could do is give me a call and ask if i did receive the email. They deducted extra money without permission from me so how many other people have they done this with. The day when i signed up no one told me to do this other wise i would have keep an extra eye on the date. I asked if they could reimbursed me for this amount but they say that they can not do that. So now i will have a look to get another medical aid where they do not deduct money like they want. And I must pay back the company now for the amount that was to much