Makro is hopeless

Bought a Sand filter from Makro online. They supply it thru PoolDistributionCentrePTYLTD. Deal was good except I did not see it was a 2 bag filter. Item arrives on the 4th Dec - I noticed that I ordered the incorrect size. I immediately log an return and the pictures Item still in original package as per courier. It takes Makro a week to collect it. It is now another week and they still have not refunded me. Excuses that it is being assessed.