I am trying to set up direct debit payment but my app is telling me I have an outstanding balance. I've just paid it twice and my app is still telling me I owe a payment.

I now think that I have overpaid by £10 and that you now either owe me the money or I have paid my next month's bill in advance.

Can someone please get back to me informing me whether I:

Have paid my bill and how I can now set up my direct debit 

Have in fact paid too much and if so whether this can be put forward and just pay off my June bill now.

Thank you in advance for you help with these matters.