Incorrect mobile contract renewal date - complaint

I renewed my 24month mobile contract with Telkom in July 2019 and even have every proof thereof, however, when I check on my device when my contract ends it says the 28/12/2022. I have since made lots of attempts to request that this is rectified and to this day I have not received any call or feedback as promised. I first logged a complaint on the 04 June 2020 - case number ***2 and was promised to be called in 72 hours and that never happened. I have been following up on a monthly basis and to this day (4 months later) the issue has not been resolved. Is this the type of service I am paying for, and how Telkom ***** their customers hoping they will never take note. My device was delivered on the 12 July 2019 @ 11h16. I need this matter resolved asap or I will take this matter further. Telkom needs to catch a wake up call, their service is disgusting. with all the attempts and calls I have made to Telkom, they don't seem to bother. How many of these similar issues are they sitting with and just doing nothing about them.