Telkom *****ing 11GB data in one day and wont help me. Also has another person registered on my account using my number but cant tell me why.

I have had a Telkom mobile data contract with 10GB + 5GB night Surfer. For a year I got to around the 28th of the month before my data ran out. The last two months my data was all gone at the 12th of the month. This month on the 11th I checked my data ballance and it was at 8.2GB with 3.9 GB night surfer so I switched of my router and left home. The next day I switched on my router and my ballance was 0GB so that means that in one day I lost 8.2GB without my router being switched on. I switched it off again and this morning when I wanted to use my night surfer thar 3.9GB had also dissapeared without my router being on. This means that telkom took 11Gb of data in 24 hours without my router being on. I then logged in to my Telkom online account and saw that there is a person named Andile Dlamini registered on my account and I have never heard of such person. I went to the telkom Mobile store in Key west and was helped by Debora ( the laziest person with the worst attitude I have ever worked with in my life) who just told me that she will log in a request and that I had to wait 7 business days for an answer. I use this Wifi for work so Telkom expects me to just give up 7 days worth of work so they can take their time to help clients. Debora also told me that the person registered to my account is "nothing". No idea how this can be the case. Over 3 months Telkom has ****** more than 30GB worth of data from me in this way. They have terrible attitudes and won't help customers. This is why telkom has the cheapest data deals, because they don't actually give you that amount of data. I am currently paying R200pm for someone else to use my data and whenever I load 2gb of data it disapears in an hour without me using any of it. According to Debora at Key West store she logged a case so it is not her problem. Terrible Telkom.