Money down the drain

I wrote a review on 30 September, 12th October still no resolution to my issue. My internet strength is measuring at average, 55 dBm to be exact. My connection is always buffering, all you guys do is to write emails asking for the same information Re: address, sim card no but nothing gets resolved.

How does cancelation work? I can't continue like this. Do I give 30 days notice or do I just select cancel and the connection will be terminated immediately and a pro rata refund will be processed for the remainder of the current month?