Paying double

I have been double debit. 1st debit order went through on the 28th March, now again the debit order went off on the 1st April. I want my monet back & also cancell with rain. when you call them you are told they will escalate it & somneone will call you backl & NO ONE EVER CALLS BACK. I am tired. I have queried my bill before 7 was told i will be called till today the bill is incorrect. now this double debit.