Terrible service & payment telephone number a disgrace

I was taken in by the lady a Debehams to take out a store card as this would save me 20% that day, as i have never had a store card I was a bit reluctant, but as the purchase was over £100, I thought I would take the card pay it off and then close down the account job done.
Two weeks later the statement came and I payed via the NewDay telephone number to the lady on the other end of the line, all gone through phone down, next job close the account.

2 days later I received a phone call from NEWDAY saying I had not paid and a late payment and adim charge would be applied to the account. After explaining to man I had a copy of the transaction number and the ladys name I spoke to, he would have non of it and said payment with costs would be adding an extra £27.50 to the invoice.

I phoned my bank got a mini statement showing the money had gone out and their referance number I phoned back. After 1HOUR and 50 mins some one spoke to me whom could not undrestand english and was told to ring back in a few days time as their system was down and the line went dead.

I have now received a late payment letter plus charges and letter explaining if I dont pay my details will be passed top a credit debit agency I have been to Debenhams but no one is interested in your worries, so after taking advice i was told to pay again which I just have. NEWDAY must be laughing all the way to the bank, 5 to 10 pence per min for phone call and no resolution centre so everytime you make a phone call their quids in.

I dont know at Debenhams who appointed these peole to look after customer accounts along with a number of other large comapnies but their sevice and reputaion is a disgrace