Misleading advertising - WaveInn

I ordered 2 boat seat swivels from WaveInn in November 2018 through their website and transferred R572.85 into their account, which was confirmed on 17 November with the following:

Hi Daniel, thank you for shopping at Tradeinn! We assure you that your order will receive our best attention. Please find below the details of your order. > Order number: ********** 5 Estimated delivery date: Estimated delivery date at your home between *Tue. 27 Nov. * and *Mon. 03 Dec. * (tracked delivery).

After many inquiries I finally received an answer about the true state of affairs on 24 December, namely:

Dear Daniel Buijs, Thank you for contacting us. Date Status of Shipment Country of Destination 19-12-2018 18:54 The consignment has arrived in the country of destination SOUTH AFRICA. Please note that your parcel is in customs and as this parcel is in customs it may take up to 6 weeks to release the parcel sometime more then that, this is customs procedure of ZA and we cannot intervene in that.

I have been renovating a fishing boat and my nephew came to visit for the Christmas holidays and we planned a to do a lot of bass fishing. WaveInn's predicted delivery date of 3 December and their subsequent non-delivery has caused a serious inconvenience because we have been limited to fishing from the banks in shallow water instead of the deep water where bass keep when it is hot because I couldn't install the seats.

Kind Regards

Daan Buijs