Vodafone billing "upgrade"

Has anyone else been impacted by Vodafone's "upgrade?" I've been a Vodafone customer for 4.5 years and on a contract that was paid by d/d on the 23rd of the month until January 2018. Without notice the payment date changed to the 5th of the month with payments taken on 5/2 & 5/3. Again with NO notice a second payment was taken on 26/3....21 days after the last payment!!! My bill was issued today with payment set for 3/5!!! I phoned to complain and was told that billing dates now occur 7 - 10 days after the date the monthly allowance ends with payment collected 14 days after the billing date.

I now have NO idea when I'll be billed let alone when or how many payments will be taken. Vodafone customer care sucks....will be leaving when my contract is up!