Cancelled my contact and tired to do a new contact

On Friday my husband and closed our business and went to Hillcrest telkom store as we app**** at musgrave store to add on to my current package the telkom mix I received an sms to say please go to Hillcrest telkom store and pickup your iPhone 6 and pay a deposit of 700 which was fine and I did after making me wait to 1 hour she tells me she can not give me the phone she needs to cancel my current contract signed and redo after much arguments she did and then says she can't give me the phone unless I pay a further 3000 deposit (2 hrs) later. After arguing with me and questioning me as to who am I angry with she then calls her manager who tries to defend her actions! After telling me that I need to pay the further 3000 even though I have the sms to say pick up your iPhone 6 n pay 700 deposit! Time wasted and while I was there there was 5 other customers 3 of which who where upset with their service received from this branch! 1 customer was left without a phone for a month and other was still receiving bills and the other had a prob with Internet! Sindi actually stood in the store shouting at me I front of all those customers!