Green Star Energy

I switched from Green Star to Avro around september. Had no problem with Green Star up until this point. But to be honest, both suppliers have been equally unhelpful. When trying to get my final bill from Green Star I gave both parties the meter readings, in fact a selection. These then bore no resemblance to the readings they used for my final bill. Having had a credit of £92 when I switched, even allowing for the period of transfer (so I stopped my direct debit) they reconciled the account going back 2 years making the statement incomprehensible. The chap I spoke to agreed. Also compared the bill to the same period the previous year, my consumption appeared to have more than doubled when I am quite frugal so highly unlikely to be correct. I then get emails saying please supply 2 sets of readings followed by another email saying that it is Avro's business to supply readings! Avro are no better as they suggest that Green Star need to do so! I am definitely losing the plot with both of them. I doubt they have the sense to talk to each other!!! I feel like a ping pong.