Adding Static IP block "blew up" my broadband! :(

I've owned and operated my own IT support firm for 23 years. I've been a PC user since I bought an Apple II Plus in 1979. I've been a Comcast Business user for probably 2 years now with almost zero complaints or problems. Wanted to get that all established before my post below.

I have two broadband circuits; Comcast and U-Verse. I've been very please with Comcast but not so much with U-Verse. I've only kept U-Verse around because I have a block of static IP addresses with them and was too lazy to re-configure my devices that need static addresses. After yet another price increase, I decided it was time to pull the trigger and fire U-Verse.

I called Comcast Customer service about 2 hours ago and asked them to set me up with the 5 static IP addresses for $19.95 per month. Agent did so in a little over 5 minutes. For the next hour and a half after that, I was in IT heck. I was getting high ping times, ping time outs, most web sites wouldn't display and those that did would take minutes to "paint". Most importantly, I couldn't maintain a VPN tunnel to one of my clients which prevented me from accessing their Exchange server for email. Almost as importantly, I couldn't access a cloud server in TX that allowed my to monitor multiple sites and, if necessary, remote in to correct problems. I was in effect 90% dead in the water.

Mr. Comcast agent proceeded to tell me it was all on my end. More than 300 NAT translations. I needed more bandwidth. Comcast isn't responsible for remote sites and their lack of connectivity. Etc. Etc. My protestations that everything worked just fine before the switch were all met with "meh". 

I finally told him to just put everything back the way it was. He did this by performing a factory reset of my modem/router. I went from 90% dead to 100% dead for almost 1/2 hour. While he was doing this, my line (not a Comcast line) magically disconnected. Apparently, he sent an email to tell me we were disconnected. Yes, an email to someone without an internet connection! I only have one number associated with my account and it's in my records. Not sure why he didn't call that.

As of this moment, my internet has come back up and is back to working perfectly. Same number of users/devices/NAT translations, etc.. 

Q1 - Has anyone experienced similar problems? Other than the last 2 hours, I've been please with Comcast and would rather have my statics there so I can get rid of U-Verse. Any suggestions?

Q2 - I'm not one to moan and groan or b1tch excessively. However, I went from a pleasant conversation to an extraordinarily frustrating one. My agent would just not listen or acknowledge the logic of what was going on. How does one register a complaint without calling and being on hold for 20 minutes?

Thanks for wading through all this