WinkEye wrote:
I have set read receipts to off for contacts.
What does this mean exactly? I am especially puzzled by your saying "for contacts."
In particular, the only read receipts the iPhone uses is iMessage receipts. You may change those at Settings > Messages > Send Read Receipts. But they apply to all iMessage users - there is no way to isolate this setting to specific contacts. Nor may you send or receive email receipts or SMS text message receipts.