Marketing calls driving me up the walls!!!

I've got two vehicles financed with MFC, had quite a few before and I have to admit that i have had no issues with them financing any of my vehicles as of yet......BUT......One thing that urinates me off is when I make it clear on the credit agreement that I do not want my number to be shared for marketing purposes and I then get up to 3 calls a day from telesales that wants to sell me all kinds of coverage. I bought my wife an i10 last year and it took about 10 calls and me getting rude to just get them to stop calling me with all kinds of offers. In January I bought a Pajero. Soon afterwards truecaller started blocking calls from "MFC". I ignored this seeing that my account is up to date and everything else on my finance account is 100% in order. Today i get a call on my landline. Low and behold.....MFC......wanting to sell me coverage on my rims and tyres....... Truecaller shows 312 blocked calls from this same number from 12 January 2018. ***???