Morning
Had a look at the supplied results and previous feedback supplied, confirmed with accounts and the ADSL service was previously Wholesale but has been moved back to Telkom and is currently managed by us, unfortunately it is not an option to move you for you are connected to a UMC (Mini DSLam)
The DSLam is however not congested, it is connected via a STM1 (155meg) link running at 18% utilization during peak times, I have no idea what your ISP is referring to by "there available ports are all use up and causes
latency on the network." I will however gladly speak to the person that gave you the information if you can supply the contact details for it makes absolutely no sense.
If you look at the supplied trace route you will see that the second hop latency is +- 10ms, once an exchange is congested this hop will increase and presently there is no indication that this is the case.
From my opinion the latency is only increasing dramatically on hop :
15 195.16.161.58 (195.16.161.58) 373.754 ms 375.520 ms 477.463 ms
So would suspect your ISP`s upstream provider.