Unfair Treatment at Ackermans Kaalfontein Korner

I Lay-buy a a phone (Hisense E31) at Ackermans Kaalfontein Korner on the 10-05-2022,when I got there I was told it's a dual Sim which Sim 1 is Vodacom Locked and I can use any other network on Sim 2,I paid and collected on 13-05-2022 because my Son needs a phone Urgently,he'sdoing Matric..I got home insert my Cell C Sim card to Sim 2,everything was fine except Data, when I checked the settings it's Data Locked to Vodacom which I can't use because I'mgettingdata from Cell C every month ..I went back to the store on 16-05-2022, because Noone explained to me that I can't use any data, I found the Acting Manager (Sipho Ma) who told me there's no solution and which it isn't my fault, I wasn't told or informed.. I need help ,I used my hard earn money to purchase a phone and now I can't use it,change it or get refund..I called Vodacom Customer care they advise me to go back to change or return ,I did but all to no Avail I went to Ackermans Ebony Park Yarona,they told me I should go there for refund or change it... The Acting Manager just put my Payment Slip on the floor and left me..This is really Unfair..Please help me,I'm just a single parent trying to Uplift my son who is in Matric right now....Please anybody....We been forced to accept a phone we can't use...Please