Thank you for that. What a mess and very upsetting when you think matters have been resolved and then they continue. I'm afraid the simplest answer is going to be that you make a formal complaint because there are a number of things which seem wrong - bailiffs turning up when monies have been paid being very upsetting. ,
There are various options to complain but the best one, if you have not already done so is to complain in writing the Council and give them a set period to respond. If they don't respond to that complaint then Council complaints are deal with by the local government ombudsman. I have included some information below - such as complaining about Council Tax, plus the information to complain to the Ombudsman. Any complaint is best to list out events in the order they happened and also include receipts or proof of payment. There is no fast-track route to, for example, take them to Court because you are expected to exhaust all your avenues of complaint.
It's always important to try to keep copies of letters and documents - easier said than done I know.
I suspect this is not the answer you wanted to hear but there is not a quick legal fix to this, you'll need to exhaust your routes of complaint which are a) the Council and then b) The Ombudsman. You should also check out what your Council's comp;aints policy is so that you know when they are required to reply.
I hope this has been of some help at least. If not, do let me know.
https://www.gov.uk/your-rights-bailiffs/how-to-complain-about-a-bailiff - I have included this but I would suggest that you keep you complaint all focused on the Council.