Unreasonable and unprofessional

I app**** for fiber with Webafrica in December. The response for installation was prompt and professional. I was informed that my line would be activated within 7-14 days. When the said time passed I followed up as I needed connection for work. I was told that there was a backlog and my query would be attended to. This past Friday almost 5 months later I got a call that the fiber guy was coming through on Saturday which he did. They connected the router same as before then I received an email that my line was now active. My issue is during the 4 months that I’ve been waiting, I made alternative arrangements to get Internet for work. I have tried to explain that to them and requested they start my the contract on the 1st June to give me time to change the arrangement with my employer but they have refused. I believe this is unreasonable as they could’ve given me a heads up that they would be activating my line especially because I have had to wait for them so long for the line to be active. After such a long time not hearing from them, the least they could’ve done was call me to discuss that the line would now be active as of such and such a date.