Customers are being urged to use any outstanding offers as soon as possible as they will all expire – regardless of when they were claimed – when the app shuts at 23:55 on 15 December.

Wuntu launched in 2017 offering customers promotions and deals on restaurants, travel, experiences and fashion as well as freebies and prize draws.

The app is no longer taking new registrations and won’t be available from app stores from 6 December.

Three said it is working on replacing Wuntu but hasn’t released any further details of the new offering.

There were mixed responses on Twitter to the news.

One customer wrote: “Gutted you’re getting rid of wuntu. What’s new in the pipe line? Have been considering going to @VodafoneUK.”

Another said: “I remember picking @ThreeUK for the fact Wuntu had some belter offers. Now just got a text saying it’s gonna be gone in 2 weeks.”

However, another user tweeted: “@ThreeUK is shutting down wuntu! Not surprised really. Their stellar offers vanished the past few years and there’s nothing that interesting but having it close down is a bit sad.”

A Three UK spokesperson said: “Following a review of our customer loyalty programme, we will be closing the wuntu app on the 16th of December.

“Loyalty is hugely important to us and our customers and we will announce a new scheme to reward our customers in the new year.”