RMGBDN

When logged into government gateway, our business always used to receive tax code notices about our employees. There would regularly be about 2/3 per month. For about a year now we haven't received anything at all. I did speak to an advisor online who got me to change some settings so we could receive them, but this hasn't worked. One of our employees spoke to me the other day and wondered why we hadn't changed her tax code, as she had a letter back in July about it. There's nothing showing on our gov gateway account, even if I backdate the date to a whole year previous. does anyone have any suggestions as what to do? This happened all of a sudden on the account, as I say one month we were receiving everything fine, then things just stopped and its been that way ever since. Thanks in advance