Disadvantages of not having a GST number

I have a GST number in goa, and I have moved to another state for personal reasons. 

I have an online only business due to which I was filing the GST returns with my original GST number, which is creating a problem since goan/sindhi frauds  are falsely claiming to own my business misusing the data I upload. 

Since my revenues are very low, I do not want to do GST registration in the state where I reside at present, and I rarely visit goa.  I am thinking of filing nil returns for my goa gst number .

What are the disadvantages of not having a GST number for a business, especially online business?