Amazon A to Z claims A to Z claim fraud Nationwide

I sold an item on amazon 45 days ago.  The buyer contacted amazon saying he was missing parts of the product claiming it was supposed to come with more than was advertised.  The ad was correct and not misleading, he received everything as advertised.  this buyer never contacted me but only amazon.  i received an email from amazon saying such, and i responded not once, not twice, but 3 times.  i didnt hear anything about it for a week so i figured they got it straightened out.  i then receive an email from a company called A to Z saying they were going to refund the buyer.  the email said because i didn't respond to their previous email within 3 days, they were siding with the buyer.  the problem is, they never sent me an email.  how could i respond to something i never received? i immediatly emailed both amazon and a to z, telling them this buyer was a fraud and i had never had any communication from a to z.  i then get another email from a to z saying they are still siding with the buyer, and get THIS, the buyer DOES NOT have to return the item.  this was a $400 item.  over the next 45 days i have spoken to supervisor after supervisor, calling once a week and being on the phone for over an hour every time with someone that couldn't bother to read the previous notes on the account, explaining, screaming, pleading my case to a robot that just says 'im sorry' 'i understand how you feel' and that it will be 'escalated'.  it had been escalated 4 times now.  my final call with them, i got tired of hearing the same lame sentences and asked to speak to a supervisor for the 100th time now. 

i finally asked the supervisor if they had the ability to either credit my amazon account or refund money.  she said customer service can.  not ONE person previously in my 7 phone calls to amazon had bothered to mention that to me.  she transfered me to customer service where i gave my story - again, and i told her i had a lawyer ready who had reviewed the actions of amazon and found this deeply disturbing and we were ready to file paperwork.  (amazon claims there is no phone number for a to z, only an email address to contact them, i find it fascinating a billion dollar company does business with another company that doesn't even have a phone numer) I don't know if i just finally caught the right person at the right time, but within 5 minutes she credited my amazon account.  It just so happens i need to purchase something from amazon that is the same amount as my refund, that's why i gave them the option of either a credit to the account or cash back.  a credit to the amazon account probably looks better to them then cash.  this is a warning that ANY buyer on amazon can file these claims for any reason what so ever and they do not have to return the produt.  i have read of a ton of other people getting scammed so i am posting this to let people know to contact customer service, NOT the seller center for a refund.  and maybe threaten to sue them.