Bad service from Crocs South Africa

I am very disappointed in the customer service in dealing with Crocs. I purchased a pair of slops for my son-in-law for his birthday. They were the incorrect ones and as per Crocs policy I want to return them and replace them with another pair. I had to pay in an amount of R70 in order to do this, which I promptly did. I am still waiting for the replacement slops. On every occasion that I have phoned, I have been told by switchboard that a consultant/sales person would phone me back (they are either in a meeting or are busy). To date I have not received a phone call. The switchboard operator has been extremely helpful, unfortunately the same cannot be said for the sales staff. I wait in vain for a phone call to let me know when I will receive the replacement slops. I am not impressed. The excuse - COVID. I understand the difficulties that companies are operating under, but surely to receive a phone call is not asking too much.