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That pattern is almost always a billing problem on your WhatsApp Business account rather than anything to do with the number, the template, or PingPlug. It is narrower than it first looks: on an account in this state we have watched a utility template be delivered and read eighteen seconds before a marketing one to the same number was refused. Replies inside a customer’s 24-hour window keep working, and utility templates — order confirmations and the like — mostly do: on that same account one was delivered and read in the morning and refused with the same billing error that evening. So PingPlug keeps sending those rather than holding everything back, and you are not cut off from your customers, but an order update sent during a block is worth confirming rather than assuming. It shows a red bar across the Inbox carrying WhatsApp’s own wording and error code. Fix it in Meta Business Manager under the payment method for that WhatsApp Business account — and note that a one-off payment can go through while the stored card stays in an error state, so it is worth removing and re-adding the card.

That is WhatsApp reporting back after it had already accepted the message, so it is not something that went wrong in the app. The reason sits under the message itself, in WhatsApp’s own words and with their error code — where a billing block is involved that includes the link to settle it. A notification is raised as well, naming the number and linking to the conversation, and when several fail at once they are grouped into one alert with the count. Messages that failed before PingPlug began recording the reason show “Not delivered” on its own; for those, the notification is where to look.

Open the campaign from Broadcasts. Every recipient is listed with its own status, and where WhatsApp explained a failure the reason sits against that recipient. Reopening a campaign never sends anything twice. When you are ready to retry, “Send to the rest” picks up only the people who have not received it.

A number that has failed on every campaign and never once succeeded is usually not on WhatsApp at all, or is stored without its country code. Before a send, PingPlug tells you how many of the audience are in that state and offers to tag them “Never reached” — exclude that tag in Step 2 and you stop paying to message them.

WhatsApp allows free-form replies only within 24 hours of that person’s last message. After that, an approved template is the only thing it will deliver. The conversation header counts down the time remaining, and the composer switches to templates once it has passed.