Huawei P30 Lite For £3.50 Per Month (After cashback. Total cost £84)

Mobile Phones Direct have this phone contract for just £3.50 per month after cashback on their website. The final cost should be £85 after cashback.
You buy the contract and you will pay £20 per month. Then, every few months you claim cashback. See the picture below. Remember to put diary reminders to claim the cashback!
Might be a misprice or glitch as the normal selling price is £279 for the phone.
Remember to do the cashback at different stages over a few months to get this low price. You need to pay £20 per month but then the cashback is redeemed at stages