Online order misdeliverd

I have ordered and item online and it was now not delivered but on the app it shows delivered. I have called TFG online several times and I was told the item shows it was deliverd and signed by someone which I don't know of. I was tol then that the investigation will be do e with the courier company and will give feed back but till to date no one has contacted me (this is after 7 weeks)

Secondly I have purchased item online which was on promo and I retired to the store for smaller size same item then I was normal price which I realised it later. I then called customer care so I was told I will be credited the balance which they did but in a form of a voucher which expires within a month. When I asked if I can be credited into my account I was told that this can't be done as the voucher has already been issued. What I'm asking is for the voucher to be reversed and credit the balance into my account or atleast a voucher that will expire will expire mybe after 12 months as I'm not planing to buy anything in the next 10 months.