We changed from Pay as you Go to Pay Monthly, how do we get our accounts linked to have just 1 Direct Debit?

Hi all,

We have just recently moved into a property where the electric was a pay as you go meter and the gas a credit meter.. So the two were set up as separate accounts, since then we have had both meters changed to smart meters and the electric to a credit meter. On the OVO app it shows the two accounts but the electric account still shows as the pay as you go account and prompts me to download the OVO top up app. So I have no way of knowing my electric usage. Also we have two separate direct debits set up one for each account. And would like the two accounts to be linked a pay just one direct debit.I have tried to call and get the two linked but I seem to be getting nowhere. Anyone have any ideas of whom I should be calling to get this sorted?

Cheers.