Legally, you’ve got no claim to a return of even a penny of the Social Security taxes you’ve paid during your lifetime. From Eric Peters at ericpetersautos.com:

The real tragedy of Socialist Insecurity is just that.
Many of those forced to “contribute” all their working lives to this socialist wealth transfer scheme could probably have retired – in the sense of not having to work – well before reaching SS retirement age and not been dependent upon SS in their retirement.
And so independent of the government.
Instead, generations have been made into elderly – but ferocious – defenders of the government. Don’t touch my Social Security! say elderly conservatives.
They then wonder why leftism continues to advance . . .
The moral argument against socialism is self-evident. It is immoral to take what isn’t yours – and Social Security does exactly that, except worse. It persuades the taker that he has “contributed,” when in fact he has been taken. Financially as well as psychologically.
First, he is required – is forced – to hand over money, in most cases before he has even held it in his hand. His “contributions” are “withheld” – that is, deducted without his consent – from every paycheck, if he earns one. If not – if he is self-employed – he is obliged to actually hand over the money – 15 percent of every dollar, now – which is a “contribution” in the same way that you are a “customer” of the agency that enforces the taking, should you elect not to “contribute.”