Back and forth

I have to start with my issue from the beginning. I wanted to open an Edgars accound an take advantage of the 'buy for R1800 and get R900 off your first purchase' promotion that was being run. since i wanted a pair of specific jeans and the only store that had it was the Fourways mall store, i decided to go an open my account over there. there was no communication on when this promo would end so i wanted to get the account asap. I provided documents and details to the person assisting me (Zinhle) and she was filling out the form for me. i was told it would take 15mins, it took over 2 hours. they said i should go and that they will call. no one called to let me know the status of my pending new account. i called the store on 3 occasions within that week, each time, no one could help me. I was frustrated so i went to the Melrose Arch store to see if they could continue my application. i was then informed by the helpful staff that the person who entered my details said that i was a Miss whilst my bank statement reflected that i was married. the dialogue with head office finance lasted for another 2 hours, thy would only speak to the staff and not me. they said that i needed to go to home affairs and get a marriage certificate. i was livid, and refused as this was not my fault, i did not fill in the incorrect information. eventually, the account was opened and i could make my purchases only it was quite late and i needed to rush. the staff said that i should just get anything to the value of R1800 to get the R900 off and then exchange these items when i have time to get the discount anyway. this is what i did. i then went to the Fourways Mall store 2 days later to return what i had bought an exchange it for items i wanted including the jeans. when i got to the cashier, they could only exchange the items for the discounted value at R900 and not to the full value of R1800. right now, i am R900 out of pocket because the staff did not know how this discount worked. i would like my R900 credited to my account.