Who I have the same questioned this topic

I've updated my mobile plan after being promised from a chat live agent that I would receive Loyalty Discount on my plan ($20 off) but of course got disconnected and I went back on to talk to another live agent and they said no such thing was stated; then the agent put a note on my account as top priority. 2 weeks later I receive the current bill and the amount is over $130, with no Loyalty Discount on sight; I went back to live agent and they said, no discount has been applied on my account- basically this was just a lie to make me upgrade from my mobile plan to this unlimited data plan, which I really don't need; but I only agreed to it because I was under an impression that I was going to get $20 off each month, since I've been a Verizon costumer for over 20 years. 

What other ways to contact Verizon to get my $20 loyalty discount. ?