OMG! Sad to hear that mate. Maybe RAMPAGE VI EXTREME was EOL and they'd only OMEGA and ENCORE on their stock.
Let do this. First pickup your CPU to testing with other X299 mobo. If it working well with other mobo that your mobo was gone.
If not and your CPU still won't work at all. Trying ticket with Intel staff and beginning your CPU RMA process. It'll took around
15-30 working days but everything is free. Intel will sending you and RMA kit soon.
Other choice If you want to upgrade from your exist system to future system.
X299 and LGA 2066 was nearly EOL too. The LGA 4189 Icelake SP/X is coming on H2 2020.
If you can waiting. I'd recommend to going with LGA 4189 with 8CH DDR4 PCIe 4.0 better.
W11CANARY 26085.1 Core i9 7980XE 02007006 MCE ME 11.12.95.2499 R6E OFFICIAL BIOS 3801 SAMSUNG OG9 FW 1019.0 SSD 970 EVO PLUS 1 TB x 3 NVIDIA RTX 4090 GAME READY 551.86 64GB GSKILL DDR4 3200MHz JBL 9.1 Sound Bar DTS-X