Collections and debt validation, paid in full, pay in full

# 1) I have two accounts on my report, that have been forwarded to a Collector. I have had better response from the Creditor than theCollectors. I have not rec'vd any validations from the collectors tothis date. I want to contract the credit bureau, informing them that Ihave sent these collectors Debt validation letters with no response, butI don't want to open a can of worms. To this point, I have decided todeal with the creditor who is not on my report. Do I just send a letterto the Creditor for negotiation and deal with them?
#2) I disputed an account with a Creditor, who sent me a letter statingthey would be contacting the Credit Reporting Agencies to have the itemDeleted from my report. Two of the three have deleted the item from myreport and the other one is still holding off.
#3) I have been in dispute with a Collector on an account that was paid in full prior to them purchasing the account. I have sent them all theback up pertaining to the account with no response. I have since sentthe documents to the Credit Agencies, who, two out of three have removethe account, but again, one is not budging.
#4) Can a collector who have been DELETED from your report, go backafter the SOL have run out, no debt validation given be added back toyour report?
-------------------
anything can happen in credit reporting
sounds like your are doing all you can
i would negotiate with the first creditor of they are willing. They can ask for removal of a collection they assigned. Sometimes they don't. But if you can pay it do and go on.