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You should retain an accountant who can deal with the CRA on your behalf. You can have the accountant tell the CRA that these T5 slips are fraudulent as you do not ever get the income.
You are suffering tremendously because your former spouse is using this as a means to reduce his income and so reduce his taxes and then you are being stuck paying taxes on money you do not receive and you will lose benefits.
If this doesn't work out your next step would be to sue your former spouse for damages. But, once CRA recognizes that this is fraudulent they will no doubt reassess your former spouse likely for many years back and will also rectify the situation with you.