Spending limit being changed without my permission

On Wed 24 Feb 2016 I got an sms from Telkom about adjusting my spending limit to R350. I was told on the sms that \this will empower me to purchase additional bundles or call family and friends in case I deplete my inclusive benefits during the month\" My biggest problem with the above is that I did not ask for an adjustment as I am quite happy with the limit that I had originally set. I then decided to call the call center to resolve this. The technician on hand checked and found that my limit had not been changed yet. I asked him to set a permanent limit of R50 and he did. I received confirmation of this via sms and that it will be effective from the 1st of the following month. An hour later I received another sms stating that the limit has been set to R350 and will be effective from the 1st of the following month. I don't understand why I have to take time out of my busy schedule to fix things that I did not authorize in the first place. On top of that i learned that my previous complaint about transparency/communication with regards to my upgrade had been closed. Just like my upgrade, nothing was communicated to me. What do I have to do in order to get good service from Telkom?"