I cannot "fix" a line problem, I can only diagnose the issue. You are paying for my time and expertise to troubleshoot and diagnose the problem for you.
At this point based on what we have tested, it is a line fault and the phone company has to be involved. After the line fault is resolved if there are any lingering issues I will be happy to help further.
I am an independent technician and I've spent my personal time, unpaid, in an effort to assist with the question for which you solicited my services. This site works on the honor system, and to that end, I have prioritized working with you ahead of other paying customers.
Although you’ve already paid your fee to the site, I am only compensated for my efforts when customers such as yourself leave positive feedback for my work. I apologize this is not the outcome you had hoped for, though this is really beyond either of our control. I do hope you’ll consider leaving a 5 star rating for me, rather than “shoot the messenger”, so that I may get credit for my time spent in good faith to answer your question accurately. Rating 1 or 2, or not rating at all, does not produce a refund, it only penalizes me for trying to help.