Bad customer service, TGF owes me money for 3 months still nothing...

I opened a new acc in November with American Swiss and tried purchasing online but was unable to register online, constant technical errors..6 attempts later and still no Joy after calling the online call centre. I was advised being it a new acc. I cant purchase online till 1st installment is mad which is understandable. Then I was told to purchase an e voucher instore which I did for a purchase I wanted to make in December. Did that and the item was available at the time of purchase, it went through & I assumed my partners watch would be delivered before Christmas...a month later I followed up to find out that 3 days after my purchase online they cancelled my order cos no stock. NO communication from them advising this. I called the call centre and emailed them numerous occassions already and to date have still not recvd 3mnths later my credit or voucher via sms as promised. Emails advise being referred to relevant dept. Etc and call centre agents always promising they will get back to me. If they want u to pay ur acc. They very quick to want to report u and affect ur credit rating but they owe me money and no one can assist...I don't know what more to do but can advise that their services are pathetic and staff *********** esp. Online services..very frustrating. I do not know what more to do, pls advise if u have any suggestions?