Avoid like the plague!!!!

I had them set up the wifi at my house. In September 2019. Gave them all the details to set up a direct debit. I assumed the payments would be taken automatically. How ever in December I had a bill for double what my monthly payment was. I contacted then to find out why and they explained "it was their fault because they didn't select my account to be debited". I said it was unacceptable and not my fault to have a double payment taken. Their accounts department called me on a later date saying the only thing they can do is to keep my account in 1 month arrears and would just pay the amount that was agreed when I took the tariff. I asked for an email from them to say that it wasn't my fault the account is in debt in December 2019 however no email to date.