How do I power in slab heating?

Slabs weren’t energised in the last bill. Only use one of the A/Cs this year. Have had solar installed for years, swapped it from gross to one of the phases when the .60 cents ran out. They changed it while I was away, against ‘my explicit wishes’. I was treating the grid as a battery, very cost effective, ran the household ex-slabs on solar during the day and drew from the grid of an evening. Having swapped the analogue meter for digital same utilisation on my end, but double utilisation via the ‘smart meter’…