MTN upgrading my contract wrong and now being billed ridiculous amounts for SIM card only contract

On 13 April 2026 at 08h45, I was contacted by Phephelani Mpofu (ref: 1‑***), who assisted with the upgrade but set a spending limit of R10,475 without my knowledge or approval. I had specifically requested that no automatic top‑up be app**** once my airtime was depleted

I only discovered this error last week when I queried why my monthly bill was far higher than the agreed R379. Attempts to cancel or reduce the limit via *136*5# failed with error messages. On 24 August 2026, I spoke to another consultant, who was also unable to cancel the limit and logged a case (***) for back‑office assistance. I requested to speak to a supervisor, but instead received a message from Noxolo Nyholo and my case was closed without resolution. I have provided all the details for them to listen to the upgrade recorded call as their calls are recorded but still no assistance. I have now discovered the I have a credit limit of R5,450, which no consultant could explain. Each time I was told I would be transferred to a supervisor or team leader, the call was cut off. I am back where I started, with no assistance. I have logged multiple calls with MTN but not assisted instead MTN is debiting huge amounts from my account. This morning I was debated R1536 which they refuse to refund