Unfair billing

Hi ive used up r60 of airtime to call and im being send up and down. I wanted a contract 2 phones for r350 i was told if i qualify id be called and i could say what phones i want. Delivery man called me to ask whr i am cs i work shifts then he told me its 1 phone and i told him thats not what i asked and the contract was nt yt finalised so he must take it back i will call them now and i did. The lady said she will go to the voice recording and gt back to me she did few days later and told she sorry it was thr fault ok i said lets jst leave it when she asked me if i still wanted the original deal i said no. Then month end r800 odd went of on my bank account i called to ask what its about they said we will put in a refund request will take 7 days ok. Then r350 was paid into my account 7days later and the other money is for cancellation fees? How do i owe u cancellation fees if i was not at fault? How do u want money from me when u tell me i was not wrong?