Linked Accounts

Okay I am having huge issues with the linked account ad on offered by Xen Concept. It hasn't worked right since the first day I installed it. I went so far as to pay another developer around 150 bucks to build an extension that would allow users to switch between all their accounts, and now THAT one isn't working.

Can someone build me an ad on from scratch? I am not sure if I can pay a lot for this and I know custom development is pricy. I've already sunk a ton of money into being able to link these damn accounts.

Basically what I want is:
  • Unlimited linked accounts
  • Easily switch between any account at any time (don't have to go back to a parent account to do that)