Hi Just to reinforce what Larry said
I have checked out the kind of mic you have as the model is not one I have come across. It would seem ok but not ideal for the purpose you are using it for. It does not require phantom power as it has a 1.5v battery. replace the battery checking polarity first. If that does not work then try another mic (even a cheap karaoke mic) to see if it is your system or the mic that is giving you problems. I suspect that Larry has probably hit it on the nail. You were probably given bad advice this is a gp mic not specifically designed for vocals. Invest in a decent mic. The sm58 is probably the most popular vocal mic BUT NOT MY FAVOURITE. Shop around there are other makes and models that are similar in price and performance.