Welcome to the Community, I'm very sorry for the problems you're experiencing with your telephone service recently.
I've located your account to run some tests and we're detecting some errors, as a result I'd like to arrange for an engineer to come and take a closer look, if you're available?
I've sent you information regarding this in a private message, which you can view by clicking the envelope on the top right of this page.
We'll talk soon
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Thanks for taking the time to confirm the appointment, I appreciate it.
We'd love to hear how the appointment goes and will be here should you need any assistance moving forward.