Letsatsi Finance irritating calls

Hello Peter Consultants from Letsatsi Finance or Funeral keep on calling to sell their funeral covers to me and I have told them that I am not interested because I already have existing one with other companies... They keep on calling me,they really ****ed me off when they called me at 02H12 in the morning and at 05H45.. This is crazy and I can't tolerate them anymore ,their number is ********** 398 Please help.