What happens when customers block or report your WhatsApp business number?
Blocks and reports are the main input to your quality rating. As that rating falls, Meta lowers your messaging limit — so the practical cost of annoying people is not lost goodwill, it is a hard cap on how many people you can reach at all. A number that keeps collecting them ends up restricted.
What a block does
That person stops receiving your messages, and the signal counts against the number.
It is not one strike. The rating reflects a recent window of behaviour, so a bad campaign shows up as a cluster.
What a report adds
A report is a stronger signal than a block, because the person went out of their way to say the message should not have been sent.
Reports on marketing templates are weighted more heavily in practice than complaints about a service message somebody asked for.
What causes them
Messaging people who never opted in. This is the single largest cause, and no wording rescues it.
Sending the same broadcast to your entire list rather than the segment it applies to.
Frequency. Two messages a week to someone who wanted an order update is a lot on a channel where family messages arrive.
Making opt-out hard. If leaving is difficult, blocking is the easy alternative and it costs you more.
Recovering
Ratings recover on their own once the behaviour causing them stops. There is no appeal that speeds it up.
The fastest recovery is to stop non-essential marketing entirely for a period, keep answering people who message you, and let the recent window fill with good behaviour.
PingPlug reads your quality rating from Meta on a schedule and tells you in-app when it drops, which is the point at which changing what you send still helps. Segmenting by tag rather than broadcasting to everyone is the practical way to keep it healthy.