Bad after sales service

We purchased a Telefunken Gas/electric combination stove at the end of March 2015. One of the gas hobbs is not working at all and another must be lit using a match(not with the switch) My husband lost the sales receipt BUT we did supply a copy of our bank statement showing the purchase. I called over six times and every time I was promised by Abraham that he would refer to his manager for authorisation but NO-ONE has the decency to call back. I did not request a replacement just a call out to repair the broken hobbs.<br> <br>