Frustrated with Telkoms BS service

In June 2019 i was contacted by a sales representative to sell me Telkom's 4G LTE Uncapped Deal.After i asked the sales person what the soft cap was he/she told me they think its 200GB and after that the connection speed gets soft capped for the remainder of the month.Upon receiving the unit something told me to just find out from my colleague as to how he found his 4G LTE Uncapped contract to be because he received his the day before.He then told me that the first 150Gb is at 10Mb/s and then after the next 50GB is at 4Mb/s and then after that 2Mb/s for remainder of month.That was not what was explained to me by sales agent,so i contacted Telkom to tell them that i want to cancel the contract as this will not work for me and was not what was explained to me.The Telkom representative then told me its fine because its still within my cool off period. Telkom then arranged the courier services to come pick up the unit to send it back to them.To my surprise i received a deduction from my account in July 2019 for the unit that was returned. I phoned Telkom to ask why this has gone off my account as i have cancelled within my cool off period.They gave me a case number and told me it would be rectified. Going forward every month now i have been billed for a unit that i do not have and every time a phone Telkom they tell me they are escalating the matter and it will be resolved. The last phone call i made was on 28 Oct 2019 and was then told by Telkom that my query will be resolved and i will get feedback in 72 hours. Its been more than a month now and still no response from Telkom. How can they treat their customers like this,lie to them every time you ask them for assistance and bill them for something they do not have anymore? When will this ever be resolved?