Rejects a certain number

I have a customer with some eTalk flip phone from verizon and it is currently having an issue where it automatically rejects calls from a certain number which belongs to her friend. I tried blocking and unblocking the number but no luck.

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0

crwdns2894050:0crwdne2894050:0

crwdns2889612:0crwdne2889612:0 0
crwdns2892346:0crwdne2892346:0