Totalsports sells fitness device's with No after market or spares available in South Africa

Totalsports sells fitness device's with No after service or spares available in South Africa. We purchased a Fitbit Versa 3 watch for R5000 , We now require a battery replacement and straps and was told it's not available in South Africa. Why do Totalsports sell device's without after market or spares, some device's cost up to R10 000. please do your homework before buying from Totalsports.