Netstar Bullies

I bought a Renault in March 2019, and with it was a one year subscription to Netstar. When the one year expired, I opted not to renew my subscription and informed them when the contacted me. Since the I have send them a couple of e-mails, and also phoned, but no reply. Now they have handed me over to ITC, and I have contacted them again, still no reply. My last two reference numbers are CAS***-W0Z3 and CAS***-C8F4.