Can this issue just come to an end now

My complaint posted on the 24th July was eventually attended to after I visited this site ONLY. I was given 200MB of the 1GB for the remaining 6 days of the month and promised I would only be billed the pro-rata amount. Well it shouldn't be a surprise when I received my invoice for the month it was WELL ABOVE what I USUALLY pay per month and this after I had received next to NOTHING from you for an entire month without a battle. I did not immediately turn to HelloPeter. I tried your call centres, and your email - reference 793484, 803054 and numerous others. Your agents guaranteed this would be rectified and I would be credited the amount and yet here it is the 1st of September and the entire amount is debited from my account. I am growing increasingly upset about this poor service delivery. Why must everything become a fight. I should in NO way have to pay a full months invoice PLUS additional costs for NOTHING received - NO minutes, NO data only the use of a device just because there was an issue on YOUR side with my migration!