New U-verse down 21 consecutive days, 7 Tier 1 techs say buried cable outage, zero responses Tier 2

New U-verse acct# [edited for privacy-please do not post personal or unique information such as but not limited to full names, employee ID numbers, email addresses, phone numbers, account numbers, etc.] 100% hard down 21 consecutive days since March 23, 2018. Seven consecutive Tier1 techs separately concluded it is an outside buried cable problem and all seven said "a buried cable outage had been submitted" but nothing ever happened after that other than they tried to send out an eight Tier1 tech.  I was able to contact a Local Tier1 manager "Nick" who sent out his top senior Tier1 tech (#7) who also concluded it was outside problem and his manager Nick then proceeded to escalate/troubleshoot through to Tier2. Although Nick has been excellent at keeping me informed and appears to be determined to resolve this outage, there has yet to be any progress in his 6 days of involvement with Tier2. I don't think Nick is getting any responses from Tier2 either. 

PLEASE help resolve this now 21 day outage.