I did same thing as you did ( Paying off several collections prior to becoming more informed on do's and dont's thru information on this forum)
Water under the bridge!
I sent several GW letters to CA"s some responded some did not.
I succeeded in getting 2 accts deleted after 4-5 months. ( guess they got tired of letters and calls. )
Who are your paid collections with?
If you listed them maybe you could get some positive feedback on how to proceed from other forum members.
Don't give up!! You will be successful if you are persistent.