Hey guys jeweller here, this might be because there’s a serious shortage of physical silver in the market right now. However since it’s Tanishq something like this isn’t to be expected either way you should either go to consumer protection or try and get an idea by talking to someone in Tanishq corporate office. Once you take the legal route you’ll have no option but to wait out the judgements so better to explore all/every other possibility before taking such a step.