Managed Migration from Income Related ESA to UC

I wonder if anyone can help me understand a couple of issues am having with the Managed Migration from ESA to UC?

Firstly my assessment period was 2nd May to 1st June 2025 and so far I struggling the following:

1. ESA have come back and said that rather than a full migration to UC they are maintaining part of my ESA award but it is has been changed from Income Related ESA to Contribution Related ESA in order to maintain if I understood correctly the NI Contributions towards my State Pension (am 54yrs old). They are paying me the following components of my previous long standing award: Living Expenses and LCWA Support Group Elements which make up just over half my previous award.

2. My understanding is that this leaves the other two components namely: Extra Money for being Severely Disabled and the Disability Income Guarantee to be paid by UC, however its now a fortnight later than my Assessment Period and to date I have received nothing from them as my Claim has "yet to complete due to items which still need verification". despite many requests they cannot tell me what these unverified elements are or when it is likely to be resolved stating only that it has been marked urgent with the Team handling my case.

3. Because it hasn't completed I am unable to provide the full award breakdown to the Council so that I can get my Council Tax Reduction and they have underpaid my Landlord to the Housing Benefit Element (Paid Directly) despite being in receipt of both components of PIP ( Also running 4 month behind with my Reassessment with documents submitted back in Feb but still not Reviewed)

Is their a regulating body that I can approach with a complaint for my Journal entries are being pretty much ignored or at best hastily replied to but without answering the question asked?