LCW

Hi I'm hoping someone can help me on here I was awarded the LCW which is £128.89 per month due to a back problem and only working 8 hours per week. I also get universal credit. I received back pay up until June 10th 2021 but since then looking on my universal credit it doesn't give me onnthe break down about the £128.89 only gives me my standard allowance and my housing and says about I can earn £293.00 before they take my earnings into account. I rang uc helpline yesterday and she said she didn't really know much about it and that maybe the back pay was all I was entitled to has there is only so much you can claim on uc but I tried to explain to her that it was from January up until June 10th 2021.
So why am I not receiving the £128.89 per month she told me to put a note on my journal for my work coach.i have been awarded the LCW since July for 29months she told me. So who do I speak to regarding me not getting this extra amount every month. Please someone help with this.