Disappointed in the conoany I love

I took out a contract at the shop at Woodhead shopping centre, opposite pick n pay. Firstly it took the guy over an hour to get it done. I took the a53. Samsung. I was told it comes with 20gigs a month. I WAS NOT TOLD that I would have to spend R300 to bit the head for the charger. And I WAS NOT TOLD that it doesn't support headsets. Now a month later I'm checking my data balance and it says to me I'm on a 500meg a month bundle. So what am I paying R359 a month for. Is vodacoms policy not that THE PHOBE IS FREE on the contract anymore. 500meg and 50mins and 50dns a month that comes with the contract apparently, I can buy for R213 a month using ussd. So what is R359 getting me. I want an upgraded phone that supports headsets st no extra charge. I want my R300 refunded as I was not told about the charger head at POS, and I want 20gigs a month included in my contract. Btw I was not given a copy of my contract.