NO SERVICE AND NO INTERNET

I signed up for the LTE Contract. Got my SIM on 13 October and since then have been struggling to connect. I have been sending email after email. The answer I get is "everything is fine on our side". Today was just the last straw - I can't even run a Speedtest and when it eventually works I get 0.80 upload and 0.01 download. I tried to cancel my contract now with immediate effect (after 6 days of struggling) and now I must wait until the end of the month to give a month's notice. Really?