I have paid him but he is not providing me accounts.
Please do note that buying/selling accounts specially bitcointalk accounts is looked down up in this forum. There is no official ban on that but it is not encouraged, once caught you and the bought account(s) will be marked with a negative trust but not banned.
I can show screenshot but please tell me how should I attatch
If the deal was done on bitcointalk PMs use any image hosting site to upload the images and then use the BBcode to link the images here. But if the deal was done off-site for example, Telegram PMs or so, then I dont think anyone will help marking them as scammer because the images can be falsified easily and telegram accounts can be impersonated easily.
To be honest you dug your own grave here. You took the wrong decision of buying accounts and then got scammed for it. Not to mention scammers already know that getting a high ranked account on this forum is tough today and thus ranked accounts cost, so they use this to trap newbies.