Since the cyber attack I continue to revieve thousands of duplicate emails in my client accounts

I use windows live mail and 4 apple devices and they are all affected the same way. I note from other posts that I am not alone yet no one at Talktalk seems to be willing to fix the problem. I have been told my Talktalk engineers that they do not support client email accounts so there is nothing that can be done. Surely there must be a server issue as I have not altered my accounts and they are all being affected the same way. I have cleared the webmail account but the problem persists. My only other option to is leave Talktalk and go to another provider