Poor Service from Vodacom Online

I upgraded my Vodacom contract online in January 2023. This 24 month contract was captured as a 36 month contract and I am told that I cannot upgrade by end of the year. I have reporting this issue, followed up on numerous escalations since March this year and to date I am yet to received help. I am quite disappointed by the service. Whenever I call Vodacom online, I am moved from pillar to post and told that the issue will be resolved since they can see the fault. Unfortunately, that never happens.