Bad service and cancellation

On 2nd Jan 2025, I saw a home internet promo on MTN Online for R269 and app**** for it. I got a call same day, application completed over the phone and was told to pay an amount of R529.32 so that my order will be processed paid the amount via EFT. I received the contract via email and was told it'll take 3-5 business days. I've been waiting for almost a month since then nothing happens. I'm the one who must always call MTN for an update and always I'm being sent from pillar to post. My order number that I received via sms was ***. I'm no longer interested on the product/service. I sent a DM to MTN South Africa on the 3rd and 5th Feb 2025 when I mentioned that I would like to cancel the service and get a refund. I received a response on the 10th Feb 2025 that says I need to call 135 to cancel, so I'm the one who needs to give them a call again to cancel. I'm very irate and not happy about the non service I received from MTN.