No after sales service

Good day, I purchaced Microsoft Visio Standard 2016 on the 24th of November. I ran into installation problems as the computer notes that it cannot install the Visio license I purchased with my current Microsoft Office Professional Plus 2016 that I already have on my computer. Product key: KXMQV-Q9JQF-GPCD4-HD3M9-7GDHZ Order number ********** 753 Your assistance will be greatly appreciated. If this can’t be resolved I’m requesting a refund please.

I have tried on different platforms including telephonically to get replies to no avail - this is my last resort.