With Direct Debit payments, you, or your bank, do not make the payments - it's the company, in this case Scottish Power, who you've given permission to take money from your account whenever they wish, who take the money, and you can only hope they act responsibly when doing so.
If they say, 'We have received no(t) payment in February 2014, however, we have received two payments on 3 March 2014', then Scottish Power are at fault for not actually checking your energy statement before sending you such a baffling email.
I think you should, whenever you've got an hour or so to spare, give them a ring to clarify matters.