BCL Accountant

I have posted at least 5 different times recorded mail to Pay As You Earn and Self Assessment, HM Revenue and Customs, BX9 1AS, UTR applications on behalf of non UK residents, 64-8 agent authorisations that HMRC only process process for one or two individual and ignore the rest even though they are all posted at the same time, Not sure if the scanning service that HMRC use are not scanning the whole pack or what. The postal tracking shows a recorded delivery successfully delivered and signed, my clients are late to file their taxes in the UK and in their country of residence, they have enough, the LLp is losing its members and as an agent I am losing my non uk residents clients. When I call HMRC they send me to the webchat ( we all know this is not working), hung up on my face, or just ask me to make other applications, or simply cannot talk to me because there is no agent authorisation ( eventhough I posted it 5 times)