Over deducted for months and every time promises it'll be fixed

After contacting Platinum Life now for the 3rd month why they haven't reduced my instalments I still got deducted on the old instalment. Every time it was agreed on the R1377 instalment I got deducted R2744 . Every time they apologize but nothing has been done , then they say I'll be refunded then I don't and gets deducted again for R2744 . Again I called today to try and rectify and get refunded but today I have had it and wanted my refund but the end of the week or cancel the policy like previously but no they can quickly take your money more than they should but takes weeks phoning to get refunded. Today I have had it and now did a bank refund and Stop order . You used to be good ,now you're over priced and cannot even do a simple correction on your deduction with a simple click on the computer.