Telkom - bad service!

In July 2017 I renewed my data contract with Telkom to a Smartbroadband Wireless 20gb for R299.00pm. In October 2017 I received a call from Telkom informing me of a promotion they are running where I would receive an additional 40gb anytime and 40gb night surfer for R100.00 pm extra against the then existing contract. So in total I would receive 60gb anytime and 60gb night surfer for R399.00 pm. I asked the sales person if this would apply until the end of my contract and he said yes. He confirmed it twice. I agreed to the bonus data and it was activated. In February 2018 the bonus data of 40gb + 40gb was removed from my contract after I was told that it would apply until the end of my contract. A case was logged ( ********** 7) to their back office. I waited for 2 weeks just to be told that I have to contact the sales department on 10213. This is unacceptable! Pathetic customer service from Telkom.