After sales customer service is shocking, dishonest & shady

I bought Ricky Litchfield capsules for dogs. I paid R220 for it in the description below the item it clearly states it is 90 capsules. I received the 60 capsules & not the 90 I ordered or paid for after 2 weeks wait. Not seeing it was the wrong quantity I opened it and after first use saw it was the wrong quantity. I politely emailed and asked for a credit to be done as the 60 capsules is only R179 & I paid R220. I have had 4 different people send me reply emails to say it needs to be returned a credit cannot be done for the difference. Once I continued to insist on the credit as it is ********* business practice to keep money overcharged for an item. They gone as far as to say their supplier says that if no quantity is in the header it is automatically 60 although in the item description it says it is 90 capsules. And R220 is more or less the same price for the 90 capsules while the 60 is only R179. You would think that it would be cheaper to credit the difference than send a courier to an outlying town to collect the wrong quantity & make a cusomer wait another 2 weeks for product that should be delivered in a max of 7 days! Their after sales customer service is shocking, dishonest & shady to say the least! I cannot believe they are still in business. They could be making millions by "accidentally" send the wrong quantity item & refusing to credit the difference. After refusing to accept their explanation my emails just go ignored & unanswered. I will be reporting this to the consumer council.