Extremely Poor Customer Service

I had finalised an online purchase from Superbalist.Com and I paid using an ipay option whereby I log into my bank account on the website to pay for the item. The item which I had purchased was discounted at 45%. The purchase had gone through on the superbalist website and my bank account debited. Thereafter I get an email from Superbalist stating awaiting payment. I contacted the contact centre via email and NADINE PIEDT , ONLINE FASHION ASSISTANT was assigned to my query.Nadine's customer service s****s are really questionable and I had to state on 3 separate emails that the,order no was correct and I had been debited from my bank account from the,ipay option on the Superbalist website. She very subtly made it appear as if I had did something wrong. I had forwarded superbalist the proof of payment from my bank which stated all superbalist details i.e bank account no and reference no. Of the purchase and there all seemed 100% yet she says she cannot locate my funds. Thereafter I receive an email from her asking for my banking details,to deposit the funds back into my account as the promotional period had ended and I was not able to receive my discounted product. Firstly superbalist were in the wrong and I did not receive an apology for not receiving my item which I already paid for. I therefore requested a 45% discount voucher so I could purchase the item again at the identical which I was debited for. NADINE PIEDT replies , unfortunately the promotional period has ended. This is the second identical incident which I experienced with Superbalist and the first time I lost out on my discounted item, well this time I'm not accepting this. A glitch on their ipay option is their problem and needs to be attended to. All my effort and time had been wasted and what do I get out of it, absolutely nothing. I need the 45% discount voucher in order to purchase the item which I wanted. Please assist with this regard. Thank you

Regards Pravesh Mothiram ***