You didn’t give further explanation as to what happened to the cable other than "the insulation of one of the ground wire had become broken."
Sounds like you broke it. You can’t expect a company to fix an old piece of equipment (or cable in this case) - that did not occur as a result of the manufacturing or workmanship. ESPECIALLY these days where company ownership changes hands over the years. We get it that you expected immediate (and probably free) repair or replacement - many years after manufacture and/or purchase. Stop whining and trying to badmouth the company name. If you are so butt hurt about it, then don’t buy any of the new company’s products. You can replace it with a purchase of the same cable from TMR audio now available for $300. It's not like it's $30,000. Suck it up buttercup - and look at it as an opportunity to buy a new cable.