Not sure what the logic is behind this . This is bad advice.
Buying gold via purchase plan is the best way to buy physical gold. And physical gold will always work as a safety cushion if you need to take loan with security. Some banks even provide gold loan for simple interest. Also , if you are getting married , you are anyhow gonna buy gold for atleast 2-5L or higher. Planning it properly via schemes will save you money and get you better returns for what you spend.
I just got one of my schemes matured . Put 10000 for 11 months. Got 18 gms of gold averaged at 6100 accumulated via the scheme and I bought that 18gms of gold at the jewellery store while the current price of gold was 6650 . I also saved up on making charges upto 14% .
As for OP's question, I see someone else already suggesting Malabar, and I use Malabar as well. From my research, their gold scheme is actually the best in India. They allow payment online via Amazon wallet and also via credit card .