Credit not showing after item returned

After returning an item to the value of R308 the courier was quick to collect the item (item was not as advertised) I never received any info on my credit. I just recently made another purchase and after going through the checkout it never deducted the total with my credit. I had logged a call querying my credit, but to date I have not received any feedback, and my account does not have the function of showing my credit.