Non tolerance against non paying patrons? (Patreon)

So, I've been thinking, and I am sick of people pledging an amount and then not paying it out, it happens every month, and all the time I send out a message telling people to please fix it, but I'm getting real sick of getting no respons.

Should I get a no tolerance policy and just block them if they fail to answer? I feel really cheated, by maybe I shouldn't feel that way. It's mostly that they don't answer me most of the time, I understand if you want to pledge but then at the end of the month can't, I just want to know why really....

Any opinions?