Mweb and false advertising.

My father took out a Fibre deal with Mweb a few months ago. The deal was for a 10mbs download speed and a 5mbs upload. Included was the installation and router. The special on offer at the time was to sign up for a 10mbs line from June 2021, but you will receive a 20mbs line (download), until October. It is the 30 July 2021 and we haven't recieved this 20mbs speed to date. Countless calls, messages and mails have been sent. We get totally different stories from he app**** too late for the special, to he doesn't fall in the area where the special is applicable. (all proved to be wrong). The last cilomms was that they would investigate and resolve the issue. That was three weeks ago. Even if this issue gets resolved tomorrow, what will then happen to the 2 months lost due to their incompetence?