Ackerman Tenacity phone harassment and refusal to remove wrong landline number

I am absolutely sick to the back teeth about Ackerman's Financial Service, Tenacity. They certainly are persistent, annoying and dismissive. Our home landline has been consistently bombarded with speculative cold calls by people at thos so- called financial company. Four different names somehow linked to one landline and NO ONE is taking my number off their bogus database. Two calls every day asking for different people. I have been asking to sleak to a manager to get my number removed. I had to shout at one cold caller in exasperation to find out what the company was called. Terrible, disgusting harassment of a private landline