Why was my request for a certificate of residency denied at Nonthaburi Immigration despite having all the required documents?

That would be frustrating.

I used a company to get me a bank account and extension of my non o visa, no waiting in queues, well worth it for not having the hassle of misunderstanding.

I understand the frustration. Thailand is not the only low cost paradise on earth.

I got mine in chiang mai immigration while on a visa exempt thats odd

I’m beginning to believe that Thailand doesn’t want anybody here longer than 30 days. I’d love to spend my money here but they make it so darn difficult. There are other places to go visit that don’t require such stupidity. 

If you have a long term lease why not go to the government office and ask for a yellow book and pink ID card your landlord might have to go with you !

I had the same thing years ago in Ubon Ratchatani... Later found out, you get them from the Tourist Police, in Ubon

I got mine without fuss at Chaeng Watthana

Nonthaburi is a known place where it's difficult to get a certificate of residence. They have requirements like you must already be on a long-term visa and possibly that you must have already done a 90-day report. It'll be pretty much impossible to get a residence certificate from there.

Also, there is no "law" for them to know. Residence certificates are not something created by a law. They're created at the discretion of the immigration office who can set whatever policies they want regarding it.