****s and ******* change of contracts

I have to issues here. 1st issue... I December I upgraded my phone and contract but was told I would get airtime each month. Normal airtime I can use to convert to whatever I need or want. That didn't happen, in fact I got fixed minutes, SMS's and a very small amount of data. In addition, my mother's contract had been changed to the same thing (without notice or permission and without upgrading). That is not legal to change a contract without client approval! Next... I decided to try the showmax deal where I get 3 months free + 15gigs (5gigs per month for three months) and I have had constant trouble with it. I registered on the site and it show on the My Vodacom app that I have the 5gig data for Showmax but when I try logging in on any browser or the showmax app I am redirected to the registration page where it asks for my number then sends a OTP to confirm (this is when I press the login button both on the website and app). Once I recieve the OTP I put it in the top box and then it says I'm already registered with my number. Called customer care twice and got SMS's to confirm they fixed the problem but no.... Same thing still. Then, when trying to cancel the deal online I am supposed to get an OTP but I am now blocked because too many OTPs have been sent. Vodacom, I think it's best to cancel my contract with you and move over to a better provider. This isn't the first issue I have had and I'm sure it won't be the last. One of the things I notice was it only took five minutes to do the upgrade! I was supposed to get more than R100 per month of airtime per month!