No service, no wifi

Two years ago I've took out a contract for 100GB day data and night data was unlimited. I've experienced running out of day data after a few months which then inform me that my package is not available anymore and had I to change to a more expensive package to ensure enough data. A few months later no connectivity and they did a sim swop witch I had to wait days for... No use of wifi while waiting. It went well from then but then last month the 15th, I had no data, however every month I do have data rolling over. 1 November wifi worked, today 2 November 'out of bundle'. I've phoned the numbers on web page, no answering, live chat not available, submitting a query via the firm on web page, no reply. Be asure after reading complaints here, my debit order will be reversed on Monday by my bank. It's clear that this company has no service.