As of today, thanks to AyaniB, the credit for my remaining balance was placed on my credit card. I am happy this is resolved but I am not sure that anything will make me forget that this took 3 months of arguing on the phone, online and in stores. This was a huge amount of frustration and stress that I did not need in the immediate aftermath of my father's passing. I hope that Verizon customer service never makes a mistake like this again because no one should have to have their burden made so much worse.