Bad service

I am very unhappy with the service I have received. On Friday the 4th of August I called and enquired about an LTE sim. I wanted to know if its possible for me to take a 2TB deal and then if possible drop it down to a 20gig deal for the next month and then I will cancel the sim as I am aware I need 30 days notice so I'd take the 20gig for the month. I was told THATS POSSIBLE, no problem. To get it done quicker I went into the office and spoke to someone in person who assure me its possible.

When I tried to change it numerous times via the dashboard and email and then live chat and eventually a call I was told no, this is not possible. This is however NOT what we agreed on when I bought the sim and paid for my first month. I called the office and asked to speak directly to the person I spoke to at the office - I was put on hold then told he would call me back (Tuesday 29th August at 10:29). I am still waiting for him to call back. Why am I told one thing when I buy a package but something else when I want to make changes that were agreed upon when I purchased it?

I wanted this package while waiting for my Fibre to be installed. Which I app**** for with Axxess, but was told that no fibre is available in my complex, whoever looked at my case did not bother to check properly so I moved onto another company who made a booking with Frogfoot and now my fibre is installed. The sales people tell you one thing to get you to spend money but then it changes very quickly soon after!