WHERE HAS ALL THE POST GONE ??

Since lockdown on 27 March 2020, we have received postal delivery to our house only 5 times, mostly from late June. This was only current invoices and bank statements. What has happened to all the post from April to June?? This is totally unacceptable. Those letters stamps were paid for, so why not delivered?? What has been done with all this backlog post? It appears that almost every SOE is run pathetically by *********** people, who gave no pride in their work, but just want yo be paid, but not doing the work to the best of their ability. Very frustrating as these invoices are needed for tax purposes.