Why are highways allowing this and on what authority?

In February we wrote to BANES in conjunction with a local business which is being blighted by the trade waste dump on George Street asking the following:

Have BANES, as Highway Authority authorised this obstruction of the highway. If so could you, please provide any documentation of such an authorisation and tell us what procedure was followed in granting this permission? Could you also advise what processes are available to challenge this decision?

If BANES have not authorised this obstruction we would like to formally request that action be taken to have it removed.
The letter was also signed by our ward councillor. WE HAVE STILL NOT RECEIVE ANY RESPONSE and that despite the responsible cabinet member asking for an answer to be provided.