Amplifier with no serial #


Hi fellow members. Any experience with buying an Amp with no serial #. I bought an Amplifier from a well known company, a few times the Amp started going off and on. When I called the company they asked me to look for the serial # but we discovered there was none. Should I get my money back? Any avise will be great. Thanks Osiris.
osirir
I want to thank all of you for yours inputs on this post, It has been very helpful. The manufacture name I wont mention at this time I have send the Amplifier back and they don't want to refund me or send a new Amplifier with a serial #. I hope they take responsibility for their mistake. Until then I wont mention their name. Thanks.  
Sometimes equipment gets out the door without it being serialized. I this from experience and isn't something I'm proud of but that is how it is. In other words, it may not be significant. I have a nice Gibson guitar that isn't serialized; when you look into the history of that particular guitar, most of them were built that way.
Post removed 
What manufacturer is it ? If they use serial numbers and you do not have one on yours it is either a prototype or a fake ? More info would be helpful .
Not having a serial number "could" create a lot of problems down the road.

If you like the amp, I would just ask for an exchange for another one and make sure before it’s shipped it has a serial number.  Unless you bought it used?