My tenants refused to sign any notices delivered to them. So, I sent a certified mail. They were very upset that I took that approach. I explained that I have to cover myself by making sure that I have something as proof in writing, just in case there should be any disputes later. Since then, a letter regarding a rent increase was hand delivered the same day the rent was collected. They refused to sign that they received the letter; furthermore they refused to note on my copy the date of receipt. I would like to give them a letter that I am terminating their month to month lease and requesting that they vacate the premises. I am afraid that if I send this letter by certified mail, they will not pick up or accept, and therefore use the excuse that they did not receive any letter to leave the premises. I'm also very concern about having a date of receipt because I don’t want them to say that they received the letter less than 30 days. Is there an alternative method that I can use to make sure that they sign and date the letter upon receipt? Thank you.