Hello Ademide
This is a quick temp fix . Unfortunately, it requires a little bit of technical knowledge.
If your domain is routed through Cloudflare, what you can do is set up a Redirect rule pointing from your shopify domain name to your shopify subdomain .
eg mystore.com → mystore.shopify.com
So when anyone goes to mystore.com ,they will be redirected and your store will still work .
Also, you have to log into your shopify admin and make mystore.shopify.om primary to stop it from redirecting to mystore.com
At least this will stop you from bleeding customers and revenue until we figure out why MTN and Co are crazy
Cheers