Is this your home or a rental?
We used to have our house phone through Comcast when we rented it out. The phone service account was set up so that toll and international calls were blocked. This way we did not have to deal with tenants running up phone bill and having to collect after they check out. CL probably has a similar service. Perhaps that is turned on for your phone.
You will have to contact CL and check with the billing dept to see if this is the cause.
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