Misleading information, and poor customer service

I recently signed up for an LTE data solution for my home at Vodacom Blue Route Mall in Cape Town. The sales lady sold me an impressive deal which was a monthly 1TB data plan for the amount of R490. I agreed signed the contract, but didn't read the fine print, unfortunately as i trusted the sales lady, activated the sim, took my router home and all was fine. Few days before the month ended my internet shut down informing me that i ran out of data, checked on my Vodacom app what my usage was for the month, and it wasn't even 400gig yet. My data was off, so i had to purchase some extra data to get the wifi back on. Went into the shop a few days later enquiring of what this is happening and its came to my attention that the saleslady actually signed me up for a 400gig max plan. Spoke to Manager Ebrahim in the store, explained to him my dilemma, and he wasn't very helpful explaining that i signed up for that plan, and the sales lady i dealt with made the err. and she needed to fix it, as she wasn't at work, he was going to chat to her about my problem and will get back to me the following day. I was really taken aback by that approach, as a manager should have problem solution skills, but yet referred back to the agent. he didn't call me back the following day as promised, but a day after, noting that he spoke to the sales lady and came to the conclusion that she neglected to do something to put through the deal for the 1TB and it defaulted to the 400g plan for my account, he apologized, and advised that my current plan would be canceled and i need to go into the shop to go and activate another sim to update my plan, but he will call me when that will be done... that over 2 weeks ago, i still haven't received my call, and am still on the 400G plan, Went into the store 2 days ago and to speak to the manager again to get a follow up, but Ebrahim stepped out a few minutes before i got there. Spoke to another sales lady at the shop, explaining to her my scenario, she took my details and promised that she will relay the message to Ebrahim, and that he will call me back the same day. Like I've mentioned that was 2 days ago, haven't received any call from them yet. I am so appalled by the poor service i received from the staff at Vodacom Blue route, which is such a reputable company. I am a very unhappy customer and feel like cancelling this whole plan, and just go with another service provider.