I want to connect 2 ADSL lines from 2 different ISPs together for redundancy. The thing is I am connected to Telkom line 4mbs ( fastest in egory) but the line keeps on cutting. Most of the time no connection... My main concern is having a line that is not breaking... I WANT CONTINUOUS CONNECTIVITY

Line Bonding may suit your needs, but it really depends on the ISP's as some don't support this.
Further reading here: Bonding ADSL Broadband Lines - Ask Our Expert

If your primary connection is failing, does the secondary have similar problems, as it might be simpler to switch to them instead.