That's good to hear, hopefully they'll get things rolling for you. They are efficient and persistent, or at least they have been in my experience with them. Good to also hear you ended with your old ISP on friendly terms.
Last year I left Zen after they were a bit 'relaxed' with a problem I was having on my FTTC/VDSL2 connection. They sent out a voice/line engineer (not an SFI engineer), but fortunately the RWT charge was dropped as they didn't agree with Openreach to a charge on that particular appointment. I ordered a second line via AAISP with a similar issue and they were on to Openreach (via TalkTalk Business) immediately to get this looked into and eventually resolved. Four SFI engineers later, three of which were escalated, and things had greatly improved. Even a neighbor told me their connection improved as well after the work the SFI engineers had been doing for my connection
. After the positive experience with AAISP I wouldn't consider touching another ISP for FTTC/VDSL2 again unless something happened in a pretty negative way to AAISP's service.
Credit to Zen though, they did eventually allow me to leave my contract early and refunded me.