Online Refund

Utterly disturbed by the customer service received from Makro. I've purchased a stove online and returned it back to makro and was issued with a new one from the supplier i told them I want a refund and not an exchange. Makro ottery then issued me with a refund invoice on the 12 june and its the 24 June already i still haven't received the money into my bank acc, I've wasted my airtime contacting makro and none of there people are able to help me. They are telling me the money was credited into my acc i contacted my bank and no money was credited to my acc. It's been more then 7 working days and this people are going back and forth with me. They're telling me they gonna get back to me but they don't i've been phoning and phoning but these people don't know how to do their job. I won't advise anyone to purchase something online from them because you'll wait forever if you request a refund