Beares Boksburg Poor Service

Firstly opening an account was a struggle between the store and the head office that doesn't know who must do what the regional manager sorted it out and i got a credit to buy.Bought a bed and microwave from them and was delivered the next day.now barely a month later i want to buy again and the manager of Boksburg Beares tells me my credit is taken away now.How do you give someone credit and after one purchase take the rest away.....The manager keeps making the excuse of head office but they want me to come in and do a debit order.I am not willing to let them deduct what they feel like and whenever they want to but take the rest of my credit away and tell me pay first.nowhere was this in writing stated or by the manager.If i knew this i would have used it all once.