Is UPI transaction in saving account allowed ?

I am sole proprietor of a GST registered firm .Having own saving & business current bank a/c . 

Some of my customers pay me directly via UPI into my own saving account instead of business current a/c.

My business current bank a/c doesn't have UPI id .

I have asked them many times to just transfer it to my current a/c but they don't .

Is this business transaction in saving bank a/c allowed and legal ?

If not ,how this should be adjusted ?