Hi there,

This is odd, 4 weeks is a long time and something is likely going wrong. Are you positive that your 301s have been implemented correctly? Have you received any messages in Search Console/GWT that are relevant?

I would also do as Ikkie suggests and submit prominent URLs which have yet to be indexed here: https://support.google.com/webmasters/answer/6259634?hl=en

Please let me know if these checks fail or if you'd like to PM me the URL and I'll take a closer look.

Hope this helps,

Daniel