DECLINED TO BUY ON MY ACCOUNT

I am a hub accountholder. For the past 8months I haven't been receiving my monthly statements and I ask the store, they blame it on the post office strike. I went to the store in Fourways several times to change my address up to no avail. No statements yet. I HAVE NEVER SKIPPED PAYMENT but I have to guess the amount payable since I do not get statements. Today, the 14th of March 2015, I went there with my friend who wanted to buy something. I saw some nice boots then I decided to buy them for my 6yr old son. I wanted to buy them on my account only to be told I don't have buying power. I told the assistant to investigate since I had paid R450 on the 26th. She then phoned Nedbank call center only to be told that I cant buy because I paid R20 Shortfall. The assistant explained that I hadn't been receiving statements so how am I supposed to know the amount due. I then paid the R20 shortfall but was declined to buy. I spent 55 minutes in that shop and came out a very disappointed customer. NO SHOES FOR my son NO STATEMENT AND NO BUYING POWER yet I am paying a monthly club member account fee to receive a brochure and statement . Time wasted PROBLEM not solved. I'm tired really