Poor Telkom service. Breach of contract

Bought the January Deal online. Effected from 9th Jan 2018. Deal was for modem,lit box and unlimited data for R599 p.m. acc went through from the end of Jan. PROBLEMS. 1. Acc is incorrect. R599 from Jan to June equates to 3600. I have paid more than this. However bills say I still owe R1800. The service has been suspended from 13th July. An amt of R940 for devices is also included. The deal or offer did not require such payments. 2. I have yet to receive the LIT BOX, 7 months into my contract this would never happen in any civilised country 3. Numerous calls to the call centre has led to many promises made but no action. 4. Can someone please advise me on what to do. 5. I cannot get through the call centres now. Is there an email address for yellow. Can I contact any higher authority. G. Subban. Cell no. ***.