Stage 2: Problem with ammending information on the application form

I came accross this quote from @Francisca_Chiedu in another post

I was wondering if this also applies to my situation; so if I cancel my current application and submit a new one there will be no issues with having different UANs between the endorsement letter and the new application?

I have already contacted Home Office and waiting for further clarification on that. Should I also contact Tech Nation?

Thank you in advance,
Vasia