someone who can actually get my internet install complete

2 technicians from xfintiy have been in to try and complete my internet installation.  They pulled out the old line and cannot get a new line in.  I'm now being told I have to have a 3rd party contractor come in to complete the install and will be charged an additional $200.  Now I'm on the phone with the contractor Xfinity contacted and they are an overseas call center and they are asking for credit card information first before anything is done.  I want to speak with a supervisor who can actually get my installation complete