incorrect debitting

On the 15th of November 2015 when mtn was supposed to debit R99 plus their connection fee which would have amounted to R229 . They debitted R1390 from my account . I then went to the mtn shop at pick n pay centre in kroonstad to make them aware of the undue debit order amount that went threw from my account. They then told me it is not just my account that debitted the wrong amount but they are busy with it and it will be sorted soon. I went back on the 20th November 2015 since it was not yet resolved. I called 808 customer srvices to find out what was the problem, the consultant adviced me to go back to the shop where i took out the contract because it had appeared that 2 contracts where opened on my name one in October 2015 and one in November 2015. (The reference number for that call is *** ) I therefore went to the branch and the branch manager logged a qquery and forwarded it to head office and promised me it will be sorted. To my surprise on the 15th of december 2015 mtn debitted R1400. I went back to the branch and could not get helped. I called 808 again and explained the whole mess from the beginning. Nothing has been sorted out.