OP, I suggest you:
Check the V5C for the vehicle. If it's as per the notices then the mistake regarding names is the company's;
Ask the accountant why correspondence has been left lying for over a month.
IMO, if the V5C (and therefore the DVLA) address is as per the notices then the company may not distance themselves from what appears to be their accountant's* c**k-up by claiming that they(the company) didn't receive the NTO.
OP, other than the above checks there's nothing that the owner can do at present. Except reinstate the street name which has been redacted.