NO PAYMENT AFTER 10 MONTHS

My son did a shoot for this agency in July 2017 which until today we did not receive payment. we have made numerous attempts by calling and e-mailing them with no success. I have spoken to Lucy who has now blocked my number as I tried to get hold of her again. There answer is always we will get back to you before close of business but they never do. There office numbers don't work any more. I was given a number for a Nelly who handles the accounts but the phone just rings. The number is online on whatsapp but no answer when you call. My wife received a e-mail stating "we were not aware at the office that payment has not been processed". this is after many calls from me and e-mails. its obvious that my number has been blocked which is very suspicious. If only we could get some positive feedback from this company it wouldn't have reached this point. The fact that we have to contact them all the time just made things worse.