Please explain how it is illegal to call the person that sold you something defective, and refuses to refund your money?
The company that sold it to you is not the same legal entity as the execs, so calling them at home is certainly an illegal form of harassment.
I mean, OP themselves typified their behavior as "harassment", so...
> harassing each of them personally by phone in the evenings and weekends at their homes
In other words, stalking.
In the US, this would not even be close to rising to the level of stalking, in a legal sense. Even harassment could be a stretch (since obviously the legal use of harassment is different than casual conversational use). Stalking laws generally require the a “reasonable person” to fear for their safety and that the accused intended to cause them fear. Calling a business owner at inconvenient times is at best, meant to annoy. Even harassment typically involves things that have “no lawful purpose” and attempting to resolve a legitimate consumer complaint would likely be considered lawful.
Thanks for the info. This is great explanation. I had a feeling I was way off.