Overcharged for services.

Was overcharged for my holiday home service. Called in to activate the service for 1 night and was charged for a month. Called the call Centre four times, put on hold for a long time. Told me they need to check the phone call recording and will get back to me. Called me back eventually after having made numerous more calls to say they have listened to the call and agree that I told them to turn off the service at midnight the next day. Told me they would call back to arrange a refund or credit. Heard nothing, called back today and had to go through the whole process again without any resolution. Were quick to debit my account for the incorrect amount, not so quick to resolve the overcharging issue. Not impressed. This is basically *****.