Why sell old technology that doesn't work properly?

Signing up for a DSL contract with Telkom has proven to be one of the biggest mistakes I've ever made. I've had non stop connection issues since March this year and every technician that Openserve sends out confirms that the underground cables are faulty. Fibre infrastructure was installed in my apartment building earlier this year (after I signed up for this contract) but apparently that doesn't matter because it was installed by another ISP so Telkom/Openserve can't/won't migrate my connection to fibre. So I'm basically stuck paying R320/month for a faulty product for the next 1,5 years. Needless to say, I'll be moving ISP the second my contract is up.