If you performed a banishment ritual and that did not resolve the issue then it's possible it attached itself to something in the home and is using it as an anchor. We recommend smudging your home and using this invocation while smudging:
"I cast out you who are uninvited
Your presence here is revoked
No longer your power shall hold
You are lost to the oblivion"
You should also place copper items and quartz crystals around your bed to help promote a positive flow of energy.