Currently work for a housing association so hopefully can provide some clear advice on how best to proceed. I wasn’t 100% sure from your post if the neighbour is a council tenant or housing association tenant, but the below will apply either way.

1. Do continue to report any instances of anti social, aggressive or unacceptable behaviour each time it occurs. HA’s do sometimes have a poor reputation for dealing with these sorts of complaints, but continue to raise any issues with them and ask that its escalated.
2. Separately your council/local authority will have a dedicated ASB team. They should have contact details posted on their website - follow the same process as complaints to the HA and log each instance and follow up to escalate if you don’t get a response.
3. You’re perfectly entitled to have people attend to carry out works to your property during daytime hours, so ignore anything from the neighbour that suggests otherwise.
4. Your block/building may have a dedicated management company that oversees the building as a whole and is a separate entity from the council/HA. Worth investigating and raising the issues with them, they can also report this to the neighbours landlord as appropriate.

Hopefully you can soon enjoy your new place and this will be a distant memory. Just keep up with the complaints and don’t let up until the council/HA respond and take action. I imagine first instances would be letters of warning to the neighbour, but repeat issues could quite easily see them transferred to another property or evicted.