SPAM CALLS

I went online to look at their services and products. To do this I had to leave my contact details. I didn't request a call-back but received 19 calls from their telesales in 2 days! Don't even think about blocking the number, as every call is from a different number. I asked numerous times to remove me from their database but still getting calls. ARE THEY SO DESPERATE FOR BUSINESS THAT THEY BECAME A SPAMMER?