Outfox the Market disputing readings

Outfox the market are disputing meter readings for my final bill, this is despite me taking the first reading off my Smart Meter In
Home Display which was previously supplied by British Gas, I was on their free time tariff and took the reading off the total In Home Display (IHD) as this only displayed the total.

For the first 3 months I never got a bill, even though they said billing was monthly, when I contacted them my first month was £255 then following months were £42 and £47 respectively. I had done nothing to get a first months bill of £255 so complained, OFTM were basically saying it must be, that was until July 2018 when the person I spoke to at customer service said to press 9 on the meter, only I didn't have a keypad on the meter, so he said press button B and to email him the readings from the meter.

I eventually work out how this thing called a Smart Meter worked and that after going through it I got three readings, ACT 1, ACT 2 and the TOTAL reading. I email this person and give them the three readings. I thought even they could not get it wrong now, how wrong I was they put in the free time reading as the reading on the reading, they take the meaning of IDIOT to a whole new level. 

For a few months I put in the free time readings but tell them they have the readings wrong as according to the British Gas the opening reading should be 7906 and all bills should be calculated from the ACT 1 reading, but no they still used the ACT 2 reading but the ACT 1 reading for the bills and payments.If they added the free time units then I don't know.

This company should not be selling gas and electric if they don't know every supplier is offering their utility and how someone switching to their service might be effected with all the different free time or reduced rates on offer at certain times, why not just the total and that's it all this smart meter shit is too confusing for most people.