recording of customers meter readings

Meter readings taken and issued to OVO have not been acknowledged or recorded on the account. I have been sending meter reading in as photographs for several years now and with minor issues these have always been applied. Why have these stopped?

I have also sent a similar complaint into OVO without acknowledgement of reply. Why is this?

The direct debit payment has been increased without any contact or knowledge. Why is this? 

The account is in credit.