I had been using Autocad for over 20 years. I have...

I had been using Autocad for over 20 years. I have a personal copy of Autocad 2013 that I have been using for years, they will no longer allow me to use it even though I bought it as a perpetual license. They have NO customer service at all via the phone and do not bother responding to pesky e-mails. WORST COMPANY EVER! Would go below 1 star if I could