Appalling customer service from Capitec - unwilling to assist.

I have an unprocessed amount on my account for a purchase made from Woolworths a week ago. Ever since I am unable to access any of my money. I do have money in the account but my balance available shows as 0. I called their call centre who advised that I should get a written email from Woolworths stating that the pending amount did go off my account for the purchases made. Woolworths advised that this is not their problem, I paid for my purchase and received my goods, my funds has already cleared with Woolworths. Capitec just says they are unable to assist me without a letter from Woolworts. I am failing to understand why Capitec, being the bank, still shows this amount as unprocessed since the payment went through on my account and Woolwroths has received their payment. Unacceptable service. As soon as this is sorted I will be closing all accounts with Capital. Their customer service is appalling.