BAD ONLINE SERVICE AND WEBSITE

I open a 5GB data contract online in 2018 n I was paying R179 in 2019 april there was an increase on contracts but I was not informed about it. I was surprised to see the debit order of R180.56 then I called the call centre and they told me there is an increase ok It was fine. Then my contract ended in Jan 2020 I wanted to end the contract don't carry on with the contract anymore because of their service. But then last month I saw a special offer 40GB (20GB +20GB night) of R199 a month for 24months I liked the offer then I decide to take an offer and upgrade online on the vodacom website. After a few days I checked my bill again surprisingly the amount is R349 instead of R199 then again I thought its just added charges for the upgrade. I was expecting to get my 20GB but nothing I only received 6GB wow whats going on? I check my invoice again its still R347 woow when I call the call centre the lady says I did the 1GB data of R78 in Dec2019 then why am I receiving the data now and no answer, she transferred me to another consultant who then told me that I subscribed the 1GB data when I was doing an upgrade online but I was not aware and I will receive the 20GB data in the 31st of March which I think its just nonsense I did not select any 1GB data on the website. She said I must email the website to cancel that 1GB data. I don't want anything to do with VODACOM I was patient enough with them for a long time now I don't want anything to do with them they have poor service I want to cancel my contract with them I cannot deal with this anymore. They have hidden agenda on their specials and the website is poor when I did an online upgrade its seems easy all along it bad. Thank you