mislead, fashion order,credit limit decrease

i requested to order a adidas takkies as they didnt have the size 8. i was rudely told it will take 3-4 weeks to come but i only have R507 credit to order however the other stores have the size. the shoe is R750. i said by then i will have the balance R250 in my acc. the manager told me to go online and send them an email as that will be the only other way to order the size. after several emails i had to phone for a response. shannon @ head office advised me she will order the size. it will take 3-4 weeks to come.i even gave her all the stores that have size 8. she asked me which store to deliver and i said pinetown. i then receive a call from bank city truworths telling me the same as pinetown. only now i dont have R507 credit. but R292. her explanation is not valid. i asked her to phone head office to confirm my order. she was not helpful and made excuses for everything i said. i sent more emails to customer care and to date i have not received 1 call from them. my fear is that the shoe will get sold before they even read my emails. all i want is the R507 credit that i was given by several stores and for the shoe to be ordered,sent to pinetown. bal of 250 will be avail by then