TRUDEBT harassment due to Telkom giving out my Info

My debit order is for the 15th, accepted by Telkom yet every month a company TruDebt phone me and harass me for payment or proof of payment. I tried to block them everywhere, to no avail. Telkom advise ignore them but Telkom gave them my info. Extremely unprofessional and Telkom just say sorry yet I am contacted EVERY single month.